all: avoid bogus compiler warning about uninitialized variable

With LTO and optimizations, gcc issues several bogus
"maybe-uninitialized" warnings.

Work-around them by initializing the variables.

libnm-core/nm-connection.c

@@ -674,8 +674,10 @@ _nm_connection_find_base_type_setting (NMConnection *connection)
 {
 	NMConnectionPrivate *priv = NM_CONNECTION_GET_PRIVATE (connection);
 	GHashTableIter iter;
-	NMSetting *setting = NULL, *s_iter;
-	NMSettingPriority setting_prio, s_iter_prio;
+	NMSetting *setting = NULL;
+	NMSetting *s_iter;
+	NMSettingPriority setting_prio = NM_SETTING_PRIORITY_USER;
+	NMSettingPriority s_iter_prio;
 
 	g_hash_table_iter_init (&iter, priv->settings);
 	while (g_hash_table_iter_next (&iter, NULL, (gpointer *) &s_iter)) {

libnm-core/nm-setting-sriov.c

@@ -919,7 +919,7 @@ vfs_to_dbus (NMSetting *setting, const char *property)
 			GVariantBuilder vf_builder;
 			const guint *vlan_ids;
 			const char **name;
-			guint num_vlans;
+			guint num_vlans = 0;
 
 			g_variant_builder_init (&vf_builder, G_VARIANT_TYPE_VARDICT);
 			g_variant_builder_add (&vf_builder, "{sv}", "index",

shared/systemd/src/basic/hashmap.c

@@ -890,7 +890,8 @@ void internal_hashmap_clear(HashmapBase *h, free_func_t default_free_key, free_f
                  * themselves from our hash table a second time, the entry is already gone. */
 
                 while (internal_hashmap_size(h) > 0) {
-                        void *v, *k;
+                        void *k = NULL;
+                        void *v;
 
                         v = internal_hashmap_first_key_and_value(h, true, &k);
 

src/devices/nm-device.c

@@ -5643,7 +5643,6 @@ check_connection_compatible (NMDevice *self, NMConnection *connection, GError **
 	NMDeviceClass *klass;
 	const char *const *patterns;
 	NMSettingMatch *s_match;
-	guint num_patterns;
 
 	klass = NM_DEVICE_GET_CLASS (self);
 	if (klass->connection_type_check_compatible) {
@@ -5684,6 +5683,8 @@ check_connection_compatible (NMDevice *self, NMConnection *connection, GError **
 	s_match = (NMSettingMatch *) nm_connection_get_setting (connection,
 	                                                        NM_TYPE_SETTING_MATCH);
 	if (s_match) {
+		guint num_patterns = 0;
+
 		patterns = nm_setting_match_get_interface_names (s_match, &num_patterns);
 		if (!nm_wildcard_match_check (device_iface, patterns, num_patterns)) {
 			nm_utils_error_set_literal (error, NM_UTILS_ERROR_CONNECTION_AVAILABLE_TEMPORARY,

src/nm-ip4-config.c

@@ -2153,7 +2153,7 @@ nm_ip4_config_get_first_address (const NMIP4Config *self)
 const NMPlatformIP4Address *
 _nmtst_ip4_config_get_address (const NMIP4Config *self, guint i)
 {
-	NMDedupMultiIter iter;
+	NMDedupMultiIter iter = { };
 	const NMPlatformIP4Address *a = NULL;
 	guint j;