linux_usbfs: Fix exit crash on Android

In commit "89b810ec Android: Add option LIBUSB_OPTION_WEAK_AUTHORITY
to support used in apk", we should also check weak_authority when
exiting the backend.

[dickens] Fixed whitespace

Closes #842

Signed-off-by: Mark Kuo <starryalley@gmail.com>
Signed-off-by: Chris Dickens <christopher.a.dickens@gmail.com>
2 files changed