scsi: qla2xxx: Remove unnecessary null check

A null check before dma_pool_destroy is redundant, so remove it. This is
detected by coccinelle.
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Acked-by: Himanshu Madhani <hmadhani@marvell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/qla2xxx/qla_os.c

@@ -4731,8 +4731,7 @@ qla2x00_mem_free(struct qla_hw_data *ha)
 		}
 	}
 
-	if (ha->dif_bundl_pool)
-		dma_pool_destroy(ha->dif_bundl_pool);
+	dma_pool_destroy(ha->dif_bundl_pool);
 	ha->dif_bundl_pool = NULL;
 
 	qlt_mem_free(ha);