fix lint err

Author: LexLuthr

market/storageIngest/deal_ingest_snap.go

@@ -481,10 +481,6 @@ func (p *PieceIngesterSnap) AllocatePieceToSector(ctx context.Context, tx *harmo
 
 	num = &candidate.Sector
 
-	if num == nil {
-		return api.SectorOffset{}, xerrors.Errorf("expected one sector number")
-	}
-
 	if p.sealRightNow {
 		err = p.SectorStartSealing(ctx, maddr, abi.SectorNumber(*num))
 		if err != nil {