ipv4: remove the unnecessary codes in fib_info_hash_move

The whole hlist will be moved, so not need to call hlist_del before
add the hlist_node to other hlist_head.
Signed-off-by: NLi RongQing <roy.qing.li@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv4/fib_semantics.c

@@ -713,8 +713,6 @@ static void fib_info_hash_move(struct hlist_head *new_info_hash,
 			struct hlist_head *dest;
 			unsigned int new_hash;
 
-			hlist_del(&fi->fib_hash);
-
 			new_hash = fib_info_hashfn(fi);
 			dest = &new_info_hash[new_hash];
 			hlist_add_head(&fi->fib_hash, dest);
@@ -731,8 +729,6 @@ static void fib_info_hash_move(struct hlist_head *new_info_hash,
 			struct hlist_head *ldest;
 			unsigned int new_hash;
 
-			hlist_del(&fi->fib_lhash);
-
 			new_hash = fib_laddr_hashfn(fi->fib_prefsrc);
 			ldest = &new_laddrhash[new_hash];
 			hlist_add_head(&fi->fib_lhash, ldest);