[SCSI] qla4xxx: Reset seconds_since_last_heartbeat correctly.

The seconds_since_last_heartbeat should be checked for consecutive
heartbeat checks. Currently it could happen that it gets set to
max (2 seconds) for non-consecutive heartbeat checks.

Signed-off-by: Vikas Chaudhary <vikas.chaudhary@qlogic.com>
Signed-off-by: Lalit Chandivade <lalit.chandivade@qlogic.com>
Signed-off-by: Ravi Anand <ravi.anand@qlogic.com>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

drivers/scsi/qla4xxx/ql4_os.c

@@ -690,7 +690,9 @@ static void qla4_8xxx_check_fw_alive(struct scsi_qla_host *ha)
 			qla4xxx_wake_dpc(ha);
 			qla4xxx_mailbox_premature_completion(ha);
 		}
-	}
+	} else
+		ha->seconds_since_last_heartbeat = 0;
+
 	ha->fw_heartbeat_counter = fw_heartbeat_counter;
 }