octeontx2-pf: check negative error code in otx2_open()

otx2_rxtx_enable() return negative error code such as -EIO,
check -EIO rather than EIO to fix this problem.

Fixes: c9262522 ("octeontx2-pf: Disable packet I/O for graceful exit")
Signed-off-by: Su Hui <suhui@nfschina.com>
Reviewed-by: Subbaraya Sundeep <sbhatta@marvell.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Reviewed-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Link: https://lore.kernel.org/r/20240328020620.4054692-1-suhui@nfschina.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c

@@ -1933,7 +1933,7 @@ int otx2_open(struct net_device *netdev)
 	 * mcam entries are enabled to receive the packets. Hence disable the
 	 * packet I/O.
 	 */
-	if (err == EIO)
+	if (err == -EIO)
 		goto err_disable_rxtx;
 	else if (err)
 		goto err_tx_stop_queues;