net: txgbe: Remove unnecessary NULL check before free

Remove unnecessary NULL check before freeing using kvfree().
This function will ignore a NULL argument.

Flagged by Coccinelle:

  .../txgbe_hw.c:187:2-8: WARNING: NULL check before some freeing functions is not needed.

No functional change intended.
Compile tested only.
Signed-off-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20240815-txgbe-kvfree-v1-1-5ecf8656f555@kernel.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/wangxun/txgbe/txgbe_hw.c

@@ -103,8 +103,7 @@ static int txgbe_calc_eeprom_checksum(struct wx *wx, u16 *checksum)
 		if (i != wx->eeprom.sw_region_offset + TXGBE_EEPROM_CHECKSUM)
 			*checksum += local_buffer[i];
 
-	if (eeprom_ptrs)
-		kvfree(eeprom_ptrs);
+	kvfree(eeprom_ptrs);
 
 	*checksum = TXGBE_EEPROM_SUM - *checksum;