Check for failures from libusb_init() in the libusb-1.0 glue code.

BUG=chromium-os:35038
Review URL: https://codereview.chromium.org/11038043

git-svn-id: http://src.chromium.org/svn/trunk/deps/third_party/libmtp@160216 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
2 files changed