migration: Clear fd also in error cases

Not clearing the fd and closing the file makes qemu spin using 100%CPU
after incoming migration error.

See for instance bug:
https://bugzilla.redhat.com/show_bug.cgi?id=518032Signed-off-by: NJuan Quintela <quintela@redhat.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

migration-exec.c

@@ -120,12 +120,12 @@ static void exec_accept_incoming_migration(void *opaque)
     }
     qemu_announce_self();
     DPRINTF("successfully loaded vm state\n");
-    /* we've successfully migrated, close the fd */
-    qemu_set_fd_handler2(qemu_stdio_fd(f), NULL, NULL, NULL, NULL);
+
     if (autostart)
         vm_start();
 
 err:
+    qemu_set_fd_handler2(qemu_stdio_fd(f), NULL, NULL, NULL, NULL);
     qemu_fclose(f);
 }
 

migration-fd.c

@@ -113,12 +113,12 @@ static void fd_accept_incoming_migration(void *opaque)
     }
     qemu_announce_self();
     DPRINTF("successfully loaded vm state\n");
-    /* we've successfully migrated, close the fd */
-    qemu_set_fd_handler2(qemu_stdio_fd(f), NULL, NULL, NULL, NULL);
+
     if (autostart)
         vm_start();
 
 err:
+    qemu_set_fd_handler2(qemu_stdio_fd(f), NULL, NULL, NULL, NULL);
     qemu_fclose(f);
 }
 

migration-tcp.c

@@ -170,15 +170,14 @@ static void tcp_accept_incoming_migration(void *opaque)
     qemu_announce_self();
     DPRINTF("successfully loaded vm state\n");
 
-    /* we've successfully migrated, close the server socket */
-    qemu_set_fd_handler2(s, NULL, NULL, NULL, NULL);
-    close(s);
     if (autostart)
         vm_start();
 
 out_fopen:
     qemu_fclose(f);
 out:
+    qemu_set_fd_handler2(s, NULL, NULL, NULL, NULL);
+    close(s);
     close(c);
 }
 

migration-unix.c

@@ -176,13 +176,12 @@ static void unix_accept_incoming_migration(void *opaque)
     qemu_announce_self();
     DPRINTF("successfully loaded vm state\n");
 
-    /* we've successfully migrated, close the server socket */
-    qemu_set_fd_handler2(s, NULL, NULL, NULL, NULL);
-    close(s);
 
 out_fopen:
     qemu_fclose(f);
 out:
+    qemu_set_fd_handler2(s, NULL, NULL, NULL, NULL);
+    close(s);
     close(c);
 }