Linux: Fix cancel_transfer return value when cancelling a multi-urb transfer

* if we've successfully cancelled the last urb, and then another urb
  fails with errno == EINVAL, we shouldn't return LIBUSB_ERROR_NOT_FOUND

diff --git a/libusb/os/linux_usbfs.c b/libusb/os/linux_usbfs.c
index ad3c37a..703d844 100644 (file)
--- a/libusb/os/linux_usbfs.c
+++ b/libusb/os/linux_usbfs.c
@@ -1483,7 +1483,8 @@ static int discard_urbs(struct usbi_transfer *itransfer, int first, int last_plu
 
                if (EINVAL == errno) {
                        usbi_dbg("URB not found --> assuming ready to be reaped");
-                       ret = LIBUSB_ERROR_NOT_FOUND;
+                       if (i == (last_plus_one - 1))
+                               ret = LIBUSB_ERROR_NOT_FOUND;
                } else if (ENODEV == errno) {
                        usbi_dbg("Device not found for URB --> assuming ready to be reaped");
                        ret = LIBUSB_ERROR_NO_DEVICE;