net: bna: Remove unused variable 't'

Gcc report warning as follows:

drivers/net/ethernet/brocade/bna/bfa_ioc.c:1538:6: warning:
 variable 't' set but not used [-Wunused-but-set-variable]
 1538 |  u32 t;
      |      ^

After commit c107ba17 ("bna: Firmware Patch Simplification"),
't' is never used, so removing it to avoid build warning.
Reported-by: NHulk Robot <hulkci@huawei.com>
Signed-off-by: NZhang Changzhong <zhangchangzhong@huawei.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/brocade/bna/bfa_ioc.c

@@ -1535,7 +1535,6 @@ static int
 bfa_flash_fifo_flush(void __iomem *pci_bar)
 {
 	u32 i;
-	u32 t;
 	union bfa_flash_dev_status_reg dev_status;
 
 	dev_status.i = readl(pci_bar + FLI_DEV_STATUS_REG);
@@ -1545,7 +1544,7 @@ bfa_flash_fifo_flush(void __iomem *pci_bar)
 
 	/* fifo counter in terms of words */
 	for (i = 0; i < dev_status.r.fifo_cnt; i++)
-		t = readl(pci_bar + FLI_RDDATA_REG);
+		readl(pci_bar + FLI_RDDATA_REG);
 
 	/* Check the device status. It may take some time. */
 	for (i = 0; i < BFA_FLASH_CHECK_MAX; i++) {