diff --git a/src/evdev.h b/src/evdev.h
index b1d8f4dd..74696751 100644
--- a/src/evdev.h
+++ b/src/evdev.h
@@ -310,7 +310,6 @@ evdev_post_scroll(struct evdev_device *device,
 		  double dx,
 		  double dy);
 
-
 void
 evdev_stop_scroll(struct evdev_device *device,
 		  uint64_t time,
diff --git a/src/libinput-private.h b/src/libinput-private.h
index ac8f9fbf..f6c4dccc 100644
--- a/src/libinput-private.h
+++ b/src/libinput-private.h
@@ -207,7 +207,6 @@ struct libinput_event_listener {
 
 typedef void (*libinput_source_dispatch_t)(void *data);
 
-
 #define log_debug(li_, ...) log_msg((li_), LIBINPUT_LOG_PRIORITY_DEBUG, __VA_ARGS__)
 #define log_info(li_, ...) log_msg((li_), LIBINPUT_LOG_PRIORITY_INFO, __VA_ARGS__)
 #define log_error(li_, ...) log_msg((li_), LIBINPUT_LOG_PRIORITY_ERROR, __VA_ARGS__)
diff --git a/src/libinput.c b/src/libinput.c
index 3aa684a9..1abd1637 100644
--- a/src/libinput.c
+++ b/src/libinput.c
@@ -1912,7 +1912,6 @@ libinput_device_config_send_events_get_default_mode(struct libinput_device *devi
 	return LIBINPUT_CONFIG_SEND_EVENTS_ENABLED;
 }
 
-
 LIBINPUT_EXPORT int
 libinput_device_config_accel_is_available(struct libinput_device *device)
 {
diff --git a/src/libinput.h b/src/libinput.h
index 3cc041e2..2c454a7e 100644
--- a/src/libinput.h
+++ b/src/libinput.h
@@ -91,7 +91,6 @@ enum libinput_button_state {
 	LIBINPUT_BUTTON_STATE_PRESSED = 1
 };
 
-
 /**
  * @ingroup device
  *
@@ -2783,7 +2782,6 @@ libinput_device_config_click_get_method(struct libinput_device *device);
 enum libinput_config_click_method
 libinput_device_config_click_get_default_method(struct libinput_device *device);
 
-
 /**
  * @ingroup config
  *
diff --git a/src/udev-seat.c b/src/udev-seat.c
index 3d057336..6615f208 100644
--- a/src/udev-seat.c
+++ b/src/udev-seat.c
@@ -158,6 +158,8 @@ udev_input_add_devices(struct udev_input *input, struct udev *udev)
 	udev_list_entry_foreach(entry, udev_enumerate_get_list_entry(e)) {
 		path = udev_list_entry_get_name(entry);
 		device = udev_device_new_from_syspath(udev, path);
+		if (!device)
+			continue;
 
 		sysname = udev_device_get_sysname(device);
 		if (strncmp("event", sysname, 5) != 0) {
diff --git a/test/device.c b/test/device.c
index b7a23e69..a54c310f 100644
--- a/test/device.c
+++ b/test/device.c
@@ -189,7 +189,6 @@ START_TEST(device_disable_touchpad)
 	litest_touch_move_to(dev, 0, 50, 50, 90, 90, 10, 0);
 	litest_touch_up(dev, 0);
 
-
 	litest_assert_empty_queue(li);
 
 	/* no event from resuming */
@@ -519,7 +518,6 @@ START_TEST(device_disable_release_tap_n_drag)
 }
 END_TEST
 
-
 START_TEST(device_disable_release_softbutton)
 {
 	struct litest_device *dev = litest_current_device();
diff --git a/test/keyboard.c b/test/keyboard.c
index 4563ce6f..cb7ad522 100644
--- a/test/keyboard.c
+++ b/test/keyboard.c
@@ -36,7 +36,7 @@ START_TEST(keyboard_seat_key_count)
 	struct libinput_event *ev;
 	struct libinput_event_keyboard *kev;
 	int i;
-	int seat_key_count;
+	int seat_key_count = 0;
 	int expected_key_button_count = 0;
 	char device_name[255];
 
diff --git a/test/litest.c b/test/litest.c
index 199c0a17..05ed2b23 100644
--- a/test/litest.c
+++ b/test/litest.c
@@ -192,6 +192,7 @@ litest_add_tcase_for_device(struct suite *suite,
 	}
 
 	t = zalloc(sizeof(*t));
+	assert(t != NULL);
 	t->name = strdup(test_name);
 	t->tc = tcase_create(test_name);
 	list_insert(&suite->tests, &t->node);
@@ -223,6 +224,7 @@ litest_add_tcase_no_device(struct suite *suite, void *func)
 	}
 
 	t = zalloc(sizeof(*t));
+	assert(t != NULL);
 	t->name = strdup(test_name);
 	t->tc = tcase_create(test_name);
 	list_insert(&suite->tests, &t->node);
@@ -278,6 +280,7 @@ get_suite(const char *name)
 	}
 
 	s = zalloc(sizeof(*s));
+	assert(s != NULL);
 	s->name = strdup(name);
 	s->suite = suite_create(s->name);
 
@@ -816,7 +819,8 @@ litest_touch_down(struct litest_device *d, unsigned int slot,
 {
 	struct input_event *ev;
 
-	assert(++d->ntouches_down > 0);
+	assert(d->ntouches_down >= 0);
+	d->ntouches_down++;
 
 	send_btntool(d);
 
@@ -844,7 +848,8 @@ litest_touch_up(struct litest_device *d, unsigned int slot)
 		{ .type = -1, .code = -1 }
 	};
 
-	assert(--d->ntouches_down >= 0);
+	assert(d->ntouches_down > 0);
+	d->ntouches_down--;
 
 	send_btntool(d);
 
diff --git a/test/pointer.c b/test/pointer.c
index 2e52a206..24ea7266 100644
--- a/test/pointer.c
+++ b/test/pointer.c
@@ -470,7 +470,7 @@ START_TEST(pointer_seat_button_count)
 	struct libinput_event *ev;
 	struct libinput_event_pointer *tev;
 	int i;
-	int seat_button_count;
+	int seat_button_count = 0;
 	int expected_seat_button_count = 0;
 	char device_name[255];
 
diff --git a/tools/event-gui.c b/tools/event-gui.c
index 063624f3..f544b6f9 100644
--- a/tools/event-gui.c
+++ b/tools/event-gui.c
@@ -254,7 +254,6 @@ change_ptraccel(struct window *w, double amount)
 	}
 }
 
-
 static void
 handle_event_device_notify(struct libinput_event *ev)
 {