bridge: netfilter: Move sysctl-specific error code inside #ifdef

If CONFIG_SYSCTL=n:

    net/bridge/br_netfilter.c: In function ‘br_netfilter_init’:
    net/bridge/br_netfilter.c:996: warning: label ‘err1’ defined but not used

Move the label and the code after it inside the existing #ifdef to get
rid of the warning.
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/bridge/br_netfilter.c

@@ -987,15 +987,12 @@ static int __init br_netfilter_init(void)
 	if (brnf_sysctl_header == NULL) {
 		printk(KERN_WARNING
 		       "br_netfilter: can't register to sysctl.\n");
-		ret = -ENOMEM;
-		goto err1;
+		nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops));
+		return -ENOMEM;
 	}
 #endif
 	printk(KERN_NOTICE "Bridge firewalling registered\n");
 	return 0;
-err1:
-	nf_unregister_hooks(br_nf_ops, ARRAY_SIZE(br_nf_ops));
-	return ret;
 }
 
 static void __exit br_netfilter_fini(void)