migration: remove useless code.

Since 's->state' will be set in migrate_init(), there is no
need to set it before calling migrate_init(). The code and
the related comments can be removed.

Signed-off-by: Liang Li <liang.z.li@intel.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Amit Shah <amit.shah@redhat.com>
Message-Id: <1453875065-24326-1-git-send-email-liang.z.li@intel.com>
Signed-off-by: Amit Shah <amit.shah@redhat.com>

migration/migration.c

@@ -1007,12 +1007,6 @@ void qmp_migrate(const char *uri, bool has_blk, bool blk,
         return;
     }
 
-    /* We are starting a new migration, so we want to start in a clean
-       state.  This change is only needed if previous migration
-       failed/was cancelled.  We don't use migrate_set_state() because
-       we are setting the initial state, not changing it. */
-    s->state = MIGRATION_STATUS_NONE;
-
     s = migrate_init(&params);
 
     if (strstart(uri, "tcp:", &p)) {