cxgb4: unnecessary check for 0 in the free_sge_txq_uld() function

The free_sge_txq_old() function has an unnecessary txq check of 0.
This check is not necessary, since the txq pointer is initialized by the
uldtxq[i] address from the operation &txq_info->uldtxq[i], which ensures
that txq is not equal to 0.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: ab677ff ("cxgb4: Allocate Tx queues dynamically")
Signed-off-by: Mikhail Lobanov <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: Mikhail Lobanov

drivers/net/ethernet/chelsio/cxgb4/cxgb4_uld.c

@@ -406,7 +406,7 @@ free_sge_txq_uld(struct adapter *adap, struct sge_uld_txq_info *txq_info)
 	for (i = 0; i < nq; i++) {
 		struct sge_uld_txq *txq = &txq_info->uldtxq[i];
 
-		if (txq && txq->q.desc) {
+		if (txq->q.desc) {
 			tasklet_kill(&txq->qresume_tsk);
 			t4_ofld_eq_free(adap, adap->mbox, adap->pf, 0,
 					txq->q.cntxt_id);