net: caif: remove redundant assignment to variable expectlen

Variable expectlen is being assigned a value that is never read, the
assignment occurs before a return statement. The assignment is
redundant and can be removed.

Signed-off-by: Colin Ian King <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/caif/cfserl.c

···
 				if (pkt != NULL)
 					cfpkt_destroy(pkt);
 				layr->incomplete_frm = NULL;
-				expectlen = 0;
 				spin_unlock(&layr->sync);
 				return -EPROTO;
 			}