isdn: icn: use strlcpy() when parsing setup options

If you pass an invalid string here then you probably deserve the memory
corruption, but it annoys static analysis tools so lets fix it.
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/isdn/icn/icn.c

@@ -1609,7 +1609,7 @@ icn_setup(char *line)
 	if (ints[0] > 1)
 		membase = (unsigned long)ints[2];
 	if (str && *str) {
-		strcpy(sid, str);
+		strlcpy(sid, str, sizeof(sid));
 		icn_id = sid;
 		if ((p = strchr(sid, ','))) {
 			*p++ = 0;