scsi: qla2xxx: Remove increment of interface err cnt

Residual underrun is not an interface error, hence no need to increment
that count.

Fixes: dbf1f53c ("scsi: qla2xxx: Implementation to get and manage host, target stats and initiator port")
Cc: stable@vger.kernel.org
Signed-off-by: Saurav Kashyap <skashyap@marvell.com>
Signed-off-by: Nilesh Javali <njavali@marvell.com>
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/qla2xxx/qla_isr.c

@@ -3363,8 +3363,6 @@ qla2x00_status_entry(scsi_qla_host_t *vha, struct rsp_que *rsp, void *pkt)
 				       "Dropped frame(s) detected (0x%x of 0x%x bytes).\n",
 				       resid, scsi_bufflen(cp));
 
-				vha->interface_err_cnt++;
-
 				res = DID_ERROR << 16 | lscsi_status;
 				goto check_scsi_status;
 			}