vl: add missing transition debug->finish_migrate

This fixes an abort if you invoke the "migrate" command while the
guest is being debugged.

Cc: qemu-stable@nongnu.org
Cc: lcapitulino@redhat.com
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: NLuiz Capitulino <lcapitulino@redhat.com>

vl.c

@@ -591,6 +591,7 @@ typedef struct {
 static const RunStateTransition runstate_transitions_def[] = {
     /*     from      ->     to      */
     { RUN_STATE_DEBUG, RUN_STATE_RUNNING },
+    { RUN_STATE_DEBUG, RUN_STATE_FINISH_MIGRATE },
 
     { RUN_STATE_INMIGRATE, RUN_STATE_RUNNING },
     { RUN_STATE_INMIGRATE, RUN_STATE_PAUSED },