[SCSI] bfa: fix regular sparse check warnings.

Fix all sparse check warnings from make C=2.

Signed-off-by: Maggie <xmzhang@brocade.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
diff --git a/drivers/scsi/bfa/bfa_ioc.h b/drivers/scsi/bfa/bfa_ioc.h
index 9c407a8..eb1b005e 100644
--- a/drivers/scsi/bfa/bfa_ioc.h
+++ b/drivers/scsi/bfa/bfa_ioc.h
@@ -421,7 +421,7 @@
 		return bfi_image_ct_cna_get_chunk(off);	break;
 	case BFI_IMAGE_CB_FC:
 		return bfi_image_cb_fc_get_chunk(off);	break;
-	default: return 0;
+	default: return NULL;
 	}
 }