scsi: qla4xxx: Remove unused 'count' variable

clang with W=1 reports:

drivers/scsi/qla4xxx/ql4_isr.c:475:11: error: variable
  'count' set but not used [-Werror,-Wunused-but-set-variable]
        uint32_t count = 0;
                 ^
This variable is not used so remove it.
Signed-off-by: Tom Rix <trix@redhat.com>
Link: https://lore.kernel.org/r/20230331175757.1860780-1-trix@redhat.comSigned-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/qla4xxx/ql4_isr.c

@@ -472,14 +472,12 @@ static void qla4xxx_mbox_status_entry(struct scsi_qla_host *ha,
  **/
 void qla4xxx_process_response_queue(struct scsi_qla_host *ha)
 {
-	uint32_t count = 0;
 	struct srb *srb = NULL;
 	struct status_entry *sts_entry;
 
 	/* Process all responses from response queue */
 	while ((ha->response_ptr->signature != RESPONSE_PROCESSED)) {
 		sts_entry = (struct status_entry *) ha->response_ptr;
-		count++;
 
 		/* Advance pointers for next entry */
 		if (ha->response_out == (RESPONSE_QUEUE_DEPTH - 1)) {