core: add nm_match_spec_match_type_to_bool() helper to convert enum to boolean

All callers eventually want a boolean instead of a NMMatchSpecMatchType.

I think the NMMatchSpecMatchType enum still has value at the lower
layers, where the enum values are clearer (when reading the code). So
don't drop NMMatchSpecMatchType entirely.

However, let's add nm_match_spec_match_type_to_bool() to convert the
match-type to a boolean to avoid duplicating the code.

(cherry picked from commit cba8eb9784)

src/core/NetworkManagerUtils.c

@@ -918,17 +918,7 @@ nm_match_spec_device_by_pllink(const NMPlatformLink *pllink,
                              NULL,
                              NULL,
                              match_dhcp_plugin);
-
-    switch (m) {
-    case NM_MATCH_SPEC_MATCH:
-        return TRUE;
-    case NM_MATCH_SPEC_NEG_MATCH:
-        return FALSE;
-    case NM_MATCH_SPEC_NO_MATCH:
-        return no_match_value;
-    }
-    nm_assert_not_reached();
-    return no_match_value;
+    return nm_match_spec_match_type_to_bool(m, no_match_value);
 }
 
 /*****************************************************************************/

src/core/NetworkManagerUtils.h

@@ -89,6 +89,8 @@ NMConnection *nm_utils_match_connection(NMConnection *const   *connections,
                                         NMUtilsMatchFilterFunc match_filter_func,
                                         gpointer               match_filter_data);
 
+/*****************************************************************************/
+
 int nm_match_spec_device_by_pllink(const NMPlatformLink *pllink,
                                    const char           *match_device_type,
                                    const char           *match_dhcp_plugin,

src/core/devices/nm-device.c

@@ -17059,16 +17059,7 @@ nm_device_spec_match_list_full(NMDevice *self, const GSList *specs, int no_match
                              klass->get_s390_subchannels ? klass->get_s390_subchannels(self) : NULL,
                              nm_dhcp_manager_get_config(nm_dhcp_manager_get()));
 
-    switch (m) {
-    case NM_MATCH_SPEC_MATCH:
-        return TRUE;
-    case NM_MATCH_SPEC_NEG_MATCH:
-        return FALSE;
-    case NM_MATCH_SPEC_NO_MATCH:
-        return no_match_value;
-    }
-    nm_assert_not_reached();
-    return no_match_value;
+    return nm_match_spec_match_type_to_bool(m, no_match_value);
 }
 
 guint

src/core/nm-core-utils.c

@@ -1484,6 +1484,20 @@ nm_match_spec_device(const GSList *specs,
     return _match_result(has_except, has_not_except, has_match, has_match_except);
 }
 
+int
+nm_match_spec_match_type_to_bool(NMMatchSpecMatchType m, int no_match_value)
+{
+    switch (m) {
+    case NM_MATCH_SPEC_MATCH:
+        return TRUE;
+    case NM_MATCH_SPEC_NEG_MATCH:
+        return FALSE;
+    case NM_MATCH_SPEC_NO_MATCH:
+        return no_match_value;
+    }
+    return nm_assert_unreachable_val(no_match_value);
+}
+
 typedef struct {
     const char *uuid;
     const char *id;

src/core/nm-core-utils.h

@@ -193,6 +193,8 @@ typedef enum {
     NM_MATCH_SPEC_NEG_MATCH = 2,
 } NMMatchSpecMatchType;
 
+int nm_match_spec_match_type_to_bool(NMMatchSpecMatchType m, int no_match_value);
+
 NMMatchSpecMatchType nm_match_spec_device(const GSList *specs,
                                           const char   *interface_name,
                                           const char   *device_type,