quirks: use __attribute__(cleanup)

Part-of: <https://gitlab.freedesktop.org/libinput/libinput/-/merge_requests/1184>

src/quirks.c

@@ -1147,7 +1147,7 @@ quirks_init_subsystem(const char *data_path,
 		      struct libinput *libinput,
 		      enum quirks_log_type log_type)
 {
-	struct quirks_context *ctx = zalloc(sizeof *ctx);
+	_unref_(quirks_context) *ctx = zalloc(sizeof *ctx);
 
 	assert(data_path);
 
@@ -1163,19 +1163,15 @@ quirks_init_subsystem(const char *data_path,
 	ctx->dmi = init_dmi();
 	ctx->dt = init_dt();
 	if (!ctx->dmi && !ctx->dt)
-		goto error;
+		return NULL;
 
 	if (!parse_files(ctx, data_path))
-		goto error;
+		return NULL;
 
 	if (override_file && !parse_file(ctx, override_file))
-		goto error;
+		return NULL;
 
-	return ctx;
+	return steal(&ctx);
-
-error:
-	quirks_context_unref(ctx);
-	return NULL;
 }
 
 struct quirks_context *
@@ -1613,7 +1609,6 @@ struct quirks *
 quirks_fetch_for_device(struct quirks_context *ctx,
 			struct udev_device *udev_device)
 {
-	struct quirks *q = NULL;
 	struct section *s;
 	struct match *m;
 
@@ -1623,7 +1618,7 @@ quirks_fetch_for_device(struct quirks_context *ctx,
 	qlog_debug(ctx, "%s: fetching quirks\n",
 		   udev_device_get_devnode(udev_device));
 
-	q = quirks_new();
+	_unref_(quirks) *q = quirks_new();
 
 	m = match_new(udev_device, ctx->dmi, ctx->dt);
 
@@ -1634,13 +1629,12 @@ quirks_fetch_for_device(struct quirks_context *ctx,
 	match_free(m);
 
 	if (q->nproperties == 0) {
-		quirks_unref(q);
 		return NULL;
 	}
 
 	list_insert(&ctx->quirks, &q->link);
 
-	return q;
+	return steal(&q);
 }
 
 static inline struct property *

src/quirks.h

@@ -204,6 +204,8 @@ quirks_fetch_for_device(struct quirks_context *ctx,
 struct quirks *
 quirks_unref(struct quirks *q);
 
+DEFINE_UNREF_CLEANUP_FUNC(quirks);
+
 /**
  * Returns true if the given quirk applies is in this quirk list.
  */