irda: precedence bug in irlmp_seq_hb_idx()

This is decrementing the pointer, instead of the value stored in the
pointer. KASan detects it as an out of bounds reference.

Reported-by: "Berry Cheng 程君(成淼)" <[e-mail]>
Signed-off-by: Dan Carpenter <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/irda/irlmp.c

···
 	for (element = hashbin_get_first(iter->hashbin);
 	     element != NULL;
 	     element = hashbin_get_next(iter->hashbin)) {
-		if (!off || *off-- == 0) {
+		if (!off || (*off)-- == 0) {
 			/* NB: hashbin left locked */
 			return element;
 		}