ipv6: fix incorrect bitwise operator used on rt6i_flags

The use of the | operator always leads to true which looks rather
suspect to me. Fix this by using & instead to just check the
RTF_CACHE entry bit.

Detected by CoverityScan, CID#1457734, #1457747 ("Wrong operator used")

Fixes: 35732d01 ("ipv6: introduce a hash table to store dst cache")
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Acked-by: NWei Wang <weiwan@google.com>
Acked-by: NMartin KaFai Lau <kafai@fb.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv6/route.c

@@ -1415,7 +1415,7 @@ int rt6_remove_exception_rt(struct rt6_info *rt)
 	int err;
 
 	if (!from ||
-	    !(rt->rt6i_flags | RTF_CACHE))
+	    !(rt->rt6i_flags & RTF_CACHE))
 		return -EINVAL;
 
 	if (!rcu_access_pointer(from->rt6i_exception_bucket))
@@ -1459,7 +1459,7 @@ static void rt6_update_exception_stamp_rt(struct rt6_info *rt)
 	struct rt6_exception *rt6_ex;
 
 	if (!from ||
-	    !(rt->rt6i_flags | RTF_CACHE))
+	    !(rt->rt6i_flags & RTF_CACHE))
 		return;
 
 	rcu_read_lock();