st-info: Add support for OpenOCD hla_serial printing

[fw/stlink] / src / stlink-usb.c

diff --git a/src/stlink-usb.c b/src/stlink-usb.c
index 24f9769880fc9f3303fd0350db2b02d6e28b99ba..e7e029880814c4ff553fe27c4cdbeff436986ad7 100644 (file)
--- a/src/stlink-usb.c
+++ b/src/stlink-usb.c
@@ -940,8 +940,10 @@ static size_t stlink_probe_usb_devs(libusb_device **devs, stlink_t **sldevs[]) {
             WLOG("failed to get libusb device descriptor\n");
             break;
         }
+
         ret = libusb_get_string_descriptor_ascii(handle, desc.iSerialNumber, (unsigned char *)&serial, sizeof(serial));
-       if (ret < 0) *serial = 0;
+        if (ret < 0)
+          *serial = NULL;
 
         libusb_close(handle);