Presumably we should return false when the capability is missing in libztex_checkCapability.
diff --git a/libztex.c b/libztex.c
index c6bd6aa..d76d798 100644
--- a/libztex.c
+++ b/libztex.c
@@ -64,8 +64,10 @@ static bool libztex_checkDevice(struct libusb_device *dev)
static bool libztex_checkCapability(struct libztex_device *ztex, int i, int j)
{
if (!((i >= 0) && (i <= 5) && (j >= 0) && (j < 8) &&
- (((ztex->interfaceCapabilities[i] & 255) & (1 << j)) != 0)))
+ (((ztex->interfaceCapabilities[i] & 255) & (1 << j)) != 0))) {
applog(LOG_ERR, "%s: capability missing: %d %d", ztex->repr, i, i);
+ return false;
+ }
return true;
}