net: netrom: nr_in: Remove redundant assignment to ns

Variable ns is set to 'skb->data[17]' but this value is never read as
it is overwritten or not used later on, hence it is a redundant
assignment and can be removed.

Cleans up the following clang-analyzer warning:

net/netrom/nr_in.c:156:2: warning: Value stored to 'ns' is never read
[clang-analyzer-deadcode.DeadStores].

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Link: https://lore.kernel.org/r/1619603885-115604-1-git-send-email-jiapeng.chong@linux.alibaba.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: wb-zjp846396

net/netrom/nr_in.c

@@ -153,7 +153,6 @@ static int nr_state3_machine(struct sock *sk, struct sk_buff *skb, int frametype
 	int queued = 0;
 
 	nr = skb->data[18];
-	ns = skb->data[17];
 
 	switch (frametype) {
 	case NR_CONNREQ: