cifs: remove redundant assignment to pointer pneg_ctxt

The pointer pneg_ctxt is being initialized with a value that is never
read and it is being updated later with a new value.  The assignment
is redundant and can be removed.

Addresses-Coverity: ("Unused value")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

fs/cifs/smb2pdu.c

@@ -554,7 +554,7 @@ static void
 assemble_neg_contexts(struct smb2_negotiate_req *req,
 		      struct TCP_Server_Info *server, unsigned int *total_len)
 {
-	char *pneg_ctxt = (char *)req;
+	char *pneg_ctxt;
 	unsigned int ctxt_len;
 
 	if (*total_len > 200) {