Release config lock if the regex is invalid

Signed-off-by: NPavel Roskin <proski@gnu.org>
Signed-off-by: NJunio C Hamano <junkio@cox.net>

config.c

@@ -514,6 +514,8 @@ int git_config_set_multivar(const char* key, const char* value,
 				fprintf(stderr, "Invalid pattern: %s\n",
 					value_regex);
 				free(store.value_regex);
+				close(fd);
+				unlink(lock_file);
 				ret = 6;
 				goto out_free;
 			}