greatfet: don't print misleading "unknown" libusb error text

[libsigrok.git] / src / hardware / greatfet / protocol.c

diff --git a/src/hardware/greatfet/protocol.c b/src/hardware/greatfet/protocol.c
index 913f981c1f01e33cfba06159f5d228c68ff0a408..0c6c6c4ea60a208af0ed710a9e4dd9b78a892f28 100644 (file)
--- a/src/hardware/greatfet/protocol.c
+++ b/src/hardware/greatfet/protocol.c
@@ -169,7 +169,7 @@ static int greatfet_ctrl_out_in(const struct sr_dev_inst *sdi,
                flags, (void *)tx_data, tx_size, timeout_ms);
        if (sr_log_loglevel_get() >= SR_LOG_SPEW) {
                const char *msg;
-               msg = ret ? libusb_error_name(ret) : "-";
+               msg = ret < 0 ? libusb_error_name(ret) : "-";
                sr_spew("USB out, rc %d, %s", ret, msg);
        }
        if (ret < 0) {
@@ -197,7 +197,7 @@ static int greatfet_ctrl_out_in(const struct sr_dev_inst *sdi,
                0, rx_data, rx_size, timeout_ms);
        if (sr_log_loglevel_get() >= SR_LOG_SPEW) {
                const char *msg;
-               msg = ret ? libusb_error_name(ret) : "-";
+               msg = ret < 0 ? libusb_error_name(ret) : "-";
                sr_spew("USB in, rc %d, %s", ret, msg);
        }
        if (ret < 0) {