iwlwifi: pcie: returning positive instead of negative

There is a missing '-' character here so we return positive 'ENOMEM'
instead of negative.  The caller doesn't care.  All non-zero returns
are translated to '-ENOMEM' in iwl_pcie_nic_init().

This is just a cleanup.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

drivers/net/wireless/iwlwifi/pcie/tx.c

@@ -838,7 +838,7 @@ static int iwl_pcie_tx_alloc(struct iwl_trans *trans)
 				  sizeof(struct iwl_txq), GFP_KERNEL);
 	if (!trans_pcie->txq) {
 		IWL_ERR(trans, "Not enough memory for txq\n");
-		ret = ENOMEM;
+		ret = -ENOMEM;
 		goto error;
 	}