bnx2: remove redundant initializations of pointers txr and rxr

Pointers txr and rxr are being initialized and a few statements later
are being assigned new values without the original values ever being
read. The initialized values are therefore redundant and can be
removed.

Cleans up clang warnings:
drivers/net/ethernet/broadcom/bnx2.c:5821:28: warning: Value stored to
'txr' during its initialization is never read
drivers/net/ethernet/broadcom/bnx2.c:5822:28: warning: Value stored to
'rxr' during its initialization is never read
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/bnx2.c

@@ -5818,8 +5818,8 @@ bnx2_run_loopback(struct bnx2 *bp, int loopback_mode)
 	struct l2_fhdr *rx_hdr;
 	int ret = -ENODEV;
 	struct bnx2_napi *bnapi = &bp->bnx2_napi[0], *tx_napi;
-	struct bnx2_tx_ring_info *txr = &bnapi->tx_ring;
-	struct bnx2_rx_ring_info *rxr = &bnapi->rx_ring;
+	struct bnx2_tx_ring_info *txr;
+	struct bnx2_rx_ring_info *rxr;
 
 	tx_napi = bnapi;