gdth: Buffer overflow

This allows i == MAXHA, which is out of range

---

index 185e6bc..0c64940 100644
@@ -3841,7 +3841,7 @@ int __init option_setup(char *str)
 
     TRACE2(("option_setup() str %s

", str ? str:"NULL"));

- while (cur && isdigit(*cur) && i <= MAXHA) {

+    while (cur && isdigit(*cur) && i < MAXHA) {
         ints[i++] = simple_strtoul(cur, NULL, 0);
         if ((cur = strchr(cur, ',')) != NULL) cur++;
     }