Now there is spin_trylock_bh, use it rather than open coding.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>

--- a/net/ipv6/ip6_fib.c	2008-07-21 12:11:46.000000000 -0700
+++ b/net/ipv6/ip6_fib.c	2008-07-21 12:17:52.000000000 -0700
@@ -1447,10 +1447,8 @@ void fib6_run_gc(unsigned long expires, 
 		gc_args.timeout = expires ? (int)expires :
 			net->ipv6.sysctl.ip6_rt_gc_interval;
 	} else {
-		local_bh_disable();
-		if (!spin_trylock(&fib6_gc_lock)) {
+		if (!spin_trylock_bh(&fib6_gc_lock)) {
 			mod_timer(&net->ipv6.ip6_fib_timer, jiffies + HZ);
-			local_bh_enable();
 			return;
 		}
 		gc_args.timeout = net->ipv6.sysctl.ip6_rt_gc_interval;

-- 

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