Merge branch 'ztex_backlog' into bfgminer

driver-ztex.c

@@ -224,6 +224,7 @@ static int64_t ztex_scanhash(struct thr_info *thr, struct work *work,
 	memset(lastnonce, 0, sizeof(uint32_t)*ztex->numNonces);
 	
 	backlog_max = ztex->numNonces * (1 + ztex->extraSolutions);
+	backlog_max *= 2;
 	backlog = malloc(sizeof(uint32_t) * backlog_max);
 	if (backlog == NULL) {
 		applog(LOG_ERR, "%s: failed to allocate backlog[%d]", ztex->repr, backlog_max);