ipmi_ssif: Remove duplicate NULL check

Since i2c_unregister_device() became NULL-aware we may remove duplicate
NULL check.

Cc: Corey Minyard <[email protected]>
Cc: [email protected]
Signed-off-by: Andy Shevchenko <[email protected]>
Signed-off-by: Corey Minyard <[email protected]>

Author: andy-shev

drivers/char/ipmi/ipmi_ssif.c

@@ -2071,8 +2071,7 @@ static int ssif_platform_remove(struct platform_device *dev)
 		return 0;
 
 	mutex_lock(&ssif_infos_mutex);
-	if (addr_info->client)
-		i2c_unregister_device(addr_info->client);
+	i2c_unregister_device(addr_info->client);
 
 	list_del(&addr_info->link);
 	kfree(addr_info);