migration/colo.c: Remove redundant input parameter

The colo_do_failover no need the input parameter.
Signed-off-by: NZhang Chen <chen.zhang@intel.com>
Message-Id: <20190426090730.2691-2-chen.zhang@intel.com>
Reviewed-by: NDr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: NDr. David Alan Gilbert <dgilbert@redhat.com>

include/migration/colo.h

@@ -37,7 +37,7 @@ bool migration_incoming_in_colo_state(void);
 COLOMode get_colo_mode(void);
 
 /* failover */
-void colo_do_failover(MigrationState *s);
+void colo_do_failover(void);
 
 void colo_checkpoint_notify(void *opaque);
 #endif

migration/colo-failover.c

@@ -39,7 +39,7 @@ static void colo_failover_bh(void *opaque)
         return;
     }
 
-    colo_do_failover(NULL);
+    colo_do_failover();
 }
 
 void failover_request_active(Error **errp)

migration/colo.c

@@ -193,7 +193,7 @@ COLOMode get_colo_mode(void)
     }
 }
 
-void colo_do_failover(MigrationState *s)
+void colo_do_failover(void)
 {
     /* Make sure VM stopped while failover happened. */
     if (!colo_runstate_is_stopped()) {