scsi: qla2xxx: Remove setting of 'req' and 'rsp' parameters

cppcheck reports
[drivers/scsi/qla2xxx/qla_mid.c:594]: (warning) Assignment of function parameter has no effect outside the function. Did you forget dereferencing it?
[drivers/scsi/qla2xxx/qla_mid.c:620]: (warning) Assignment of function parameter has no effect outside the function. Did you forget dereferencing it?

The functions qla25xx_free_req_que() and qla25xx_free_rsp_que() are
similar.  They free a 'req' and a 'rsp' parameter respectively. The last
statement of both functions is setting the parameter to NULL. This has no
effect and can be removed.

Link: https://lore.kernel.org/r/20220521201607.4145298-1-trix@redhat.comReviewed-by: NHimanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: NTom Rix <trix@redhat.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/qla2xxx/qla_mid.c

@@ -591,7 +591,6 @@ qla25xx_free_req_que(struct scsi_qla_host *vha, struct req_que *req)
 	}
 	kfree(req->outstanding_cmds);
 	kfree(req);
-	req = NULL;
 }
 
 static void
@@ -617,7 +616,6 @@ qla25xx_free_rsp_que(struct scsi_qla_host *vha, struct rsp_que *rsp)
 		mutex_unlock(&ha->vport_lock);
 	}
 	kfree(rsp);
-	rsp = NULL;
 }
 
 int