md: make recovery started by do_md_run() visible via sync_action

By default md_do_sync() will perform recovery if no other actions are
specified.  However, action_show() relies on MD_RECOVERY_RECOVER to be
set otherwise it returns 'idle'.  So, add a missing set
MD_RECOVERY_RECOVER when starting recovery.
Signed-off-by: NDan Williams <dan.j.williams@intel.com>
Signed-off-by: NNeilBrown <neilb@suse.de>

drivers/md/md.c

@@ -4436,6 +4436,7 @@ static int do_md_run(mddev_t * mddev)
 		if (spares && mddev->pers->sync_request) {
 			mddev->recovery = 0;
 			set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
+			set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
 			mddev->sync_thread = md_register_thread(md_do_sync,
 								mddev,
 								"resync");