net/ipv6: delete redundant judgment statements

The initial value of err is -ENOBUFS, and err is guaranteed to be
less than 0 before all goto errout. Therefore, on the error path
of errout, there is no need to repeatedly judge that err is less than 0,
and delete redundant judgments to make the code more concise.
Signed-off-by: Li Zetao <lizetao1@huawei.com>
Reviewed-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv6/route.c

@@ -6193,8 +6193,7 @@ void inet6_rt_notify(int event, struct fib6_info *rt, struct nl_info *info,
 		    info->nlh, gfp_any());
 	return;
 errout:
-	if (err < 0)
-		rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
+	rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
 }
 
 void fib6_rt_update(struct net *net, struct fib6_info *rt,
@@ -6220,8 +6219,7 @@ void fib6_rt_update(struct net *net, struct fib6_info *rt,
 		    info->nlh, gfp_any());
 	return;
 errout:
-	if (err < 0)
-		rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
+	rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
 }
 
 void fib6_info_hw_flags_set(struct net *net, struct fib6_info *f6i,