Patch-from: http://bugs.gentoo.org/show_bug.cgi?id=225879
Gentoo-Bug: 225879
Signed-off-by: Robin H. Johnson <robbat2@gentoo.org>

Prevents an infinite loop if device is removed during usb_bulk_read or
usb_bulk_write.

diff -Naur libusb-0.1.12/linux.c libusb-0.1.12-new/linux.c
--- libusb-0.1.12/linux.c	2006-03-04 04:52:46.000000000 +0200
+++ libusb-0.1.12-new/linux.c	2008-06-11 14:22:20.000000000 +0300
@@ -220,6 +220,13 @@
     waiting = 1;
     context = NULL;
     while (!urb.usercontext && ((ret = ioctl(dev->fd, IOCTL_USB_REAPURBNDELAY, &context)) == -1) && waiting) {
+      if (ret == -1)
+      {
+      	if (errno == ENODEV)
+	{
+	  return -ENODEV;
+	}
+      }
       tv.tv_sec = 0;
       tv.tv_usec = 1000; // 1 msec
       select(dev->fd + 1, NULL, &writefds, NULL, &tv); //sub second wait