net: ipv6: use the new fib6_nh_release_dsts helper in fib6_nh_release

We can remove a bit of code duplication by reusing the new
fib6_nh_release_dsts helper in fib6_nh_release. Their only difference is
that fib6_nh_release's version doesn't use atomic operation to swap the
pointers because it assumes the fib6_nh is no longer visible, while
fib6_nh_release_dsts can be used anywhere.

Suggested-by: David Ahern <dsahern@gmail.com>
Signed-off-by: Nikolay Aleksandrov <nikolay@nvidia.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv6/route.c

@@ -3656,24 +3656,8 @@ void fib6_nh_release(struct fib6_nh *fib6_nh)
 
 	rcu_read_unlock();
 
-	if (fib6_nh->rt6i_pcpu) {
-		int cpu;
-
-		for_each_possible_cpu(cpu) {
-			struct rt6_info **ppcpu_rt;
-			struct rt6_info *pcpu_rt;
-
-			ppcpu_rt = per_cpu_ptr(fib6_nh->rt6i_pcpu, cpu);
-			pcpu_rt = *ppcpu_rt;
-			if (pcpu_rt) {
-				dst_dev_put(&pcpu_rt->dst);
-				dst_release(&pcpu_rt->dst);
-				*ppcpu_rt = NULL;
-			}
-		}
-
-		free_percpu(fib6_nh->rt6i_pcpu);
-	}
+	fib6_nh_release_dsts(fib6_nh);
+	free_percpu(fib6_nh->rt6i_pcpu);
 
 	fib_nh_common_release(&fib6_nh->nh_common);
 }