Fix memory leak reported by clang tool

This memory leak, although not easily reproducible,
has been detected by Static Application Security Testing
tool (trhough clang compiler). This fix eliminates it.

Signed-off-by: Sergio Arroutbi <[email protected]>

Author: sarroutbi

src/socket.c

@@ -201,6 +201,9 @@ int run_service(const char *jwkdir, int port, process_request_func pfunc)
 	r = listen_port(&slist, port);
 	if (r < 0) {
 		fprintf(stderr, "Could not listen port (%d)\n", port);
+		if (slist) {
+			free_socket_list(slist);
+		}
 		return -1;
 	}