- return usb_control_msg (udh, request_type,request, value, index,
- (char*) data, length, (int) timeout);
+ int ret;
+
+ ret = usb_control_msg (udh, request_type,request, value, index,
+ (char*) data, length, (int) timeout);
+ if (ret < 0)
+ fprintf (stderr, "usrp: usb_control_msg failed: %s\n", usb_strerror());
+
+ return ret;