qemu-ga: don't leak a file descriptor upon failed lockf

Signed-off-by: Jim Meyering <meyering@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

qemu-ga.c

@@ -247,6 +247,9 @@ static bool ga_open_pidfile(const char *pidfile)
     pidfd = open(pidfile, O_CREAT|O_WRONLY, S_IRUSR|S_IWUSR);
     if (pidfd == -1 || lockf(pidfd, F_TLOCK, 0)) {
         g_critical("Cannot lock pid file, %s", strerror(errno));
+        if (pidfd != -1) {
+            close(pidfd);
+        }
         return false;
     }