Clear handler only for valid fd

Signed-off-by: Orit Wasserman <owasserm@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
diff --git a/migration.c b/migration.c
index 1edeec5..22a05c4 100644
--- a/migration.c
+++ b/migration.c
@@ -240,7 +240,9 @@
 {
     int ret = 0;
 
-    qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL);
+    if (s->fd != -1) {
+        qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL);
+    }
 
     if (s->file) {
         DPRINTF("closing file\n");