scan-build: fix possible leaks

src/knot/main.c

@@ -154,6 +154,7 @@ int main(int argc, char **argv)
 			verbose = 1;
 			break;
 		case 'V':
+			free(config_fn);
 			printf("%s, version %s\n", "Knot DNS", PACKAGE_VERSION);
 			return 0;
 		case 'h':
@@ -308,10 +309,15 @@ int main(int argc, char **argv)
 			return do_cleanup(server, config_fn, pidf);
 		log_server_info("Server started as a daemon, PID = %ld\n", pid);
 		log_server_info("PID stored in '%s'\n", pidf);
-		if ((cwd = malloc(PATH_MAX)) != NULL)
-			cwd = getcwd(cwd, PATH_MAX);
-		if (chdir("/") != 0)
+		if ((cwd = malloc(PATH_MAX)) != NULL) {
+			if (getcwd(cwd, PATH_MAX) == NULL) {
+				log_server_info("Cannot get current working directory.\n");
+				cwd[0] = '\0';
+			}
+		}
+		if (chdir("/") != 0) {
 			log_server_warning("Server can't change working directory.\n");
+		}
 	} else {
 		log_server_info("Server started in foreground, PID = %ld\n", pid);
 		log_server_info("Server running without PID file.\n");