trivial: annotate/adjust some code to appease Coverity

cli/src/common.c

@@ -920,7 +920,7 @@ nmc_team_check_config (const char *config, char **out_config, GError **error)
 
 	/* 'config' can be either a file name or raw JSON config data */
 	if (g_file_test (config, G_FILE_TEST_EXISTS))
-		g_file_get_contents (config, &contents, NULL, NULL);
+		(void) g_file_get_contents (config, &contents, NULL, NULL);
 	else
 		contents = g_strdup (config);
 

libnm-glib/nm-remote-settings.c

@@ -662,7 +662,7 @@ nm_remote_settings_load_connections (NMRemoteSettings *settings,
 {
 	NMRemoteSettingsPrivate *priv;
 	char **my_failures = NULL;
-	gboolean ret = FALSE;
+	gboolean ret;
 
 	g_return_val_if_fail (NM_IS_REMOTE_SETTINGS (settings), FALSE);
 	g_return_val_if_fail (filenames != NULL, FALSE);
@@ -678,12 +678,13 @@ nm_remote_settings_load_connections (NMRemoteSettings *settings,
 		return FALSE;
 	}
 
-	dbus_g_proxy_call (priv->proxy, "LoadConnections", error,
+	if (!dbus_g_proxy_call (priv->proxy, "LoadConnections", error,
 	                        G_TYPE_STRV, filenames,
 	                        G_TYPE_INVALID,
 	                        G_TYPE_BOOLEAN, &ret,
 	                        G_TYPE_STRV, &my_failures,
-	                   G_TYPE_INVALID);
+	                        G_TYPE_INVALID))
+		ret = FALSE;
 
 	if (failures) {
 		if (my_failures && !*my_failures)

tui/nmt-secret-agent.c

@@ -435,14 +435,13 @@ nmt_secret_agent_get_secrets (NMSecretAgent                 *agent,
 {
 	NmtSecretAgent *self = NMT_SECRET_AGENT (agent);
 	NmtSecretAgentPrivate *priv = NMT_SECRET_AGENT_GET_PRIVATE (self);
-	NmtSecretAgentRequest *request;
 	NMSettingConnection *s_con;
 	const char *connection_type;
 	char *request_id;
 	GError *error;
 
 	request_id = g_strdup_printf ("%s/%s", connection_path, setting_name);
-	if ((request = g_hash_table_lookup (priv->requests, request_id)) != NULL) {
+	if (g_hash_table_lookup (priv->requests, request_id) != NULL) {
 		/* We already have a request pending for this (connection, setting) */
 		error = g_error_new (NM_SECRET_AGENT_ERROR, NM_SECRET_AGENT_ERROR_INTERNAL_ERROR,
 		                     "Request for %s secrets already pending", request_id);