fsdev: fix memory leak in main()

@rpath and @sock_name are not freed and leaked.

[groug, not really leaked since the program exits just after that. But it
 is always good practice to free allocated memory]

Signed-off-by: Zhipeng Lu <lu.zhipeng@zte.com.cn>
Signed-off-by: Greg Kurz <groug@kaod.org>

fsdev/virtfs-proxy-helper.c

@@ -1162,6 +1162,8 @@ int main(int argc, char **argv)
 
     process_requests(sock);
 error:
+    g_free(rpath);
+    g_free(sock_name);
     do_log(LOG_INFO, "Done\n");
     closelog();
     return 0;