Merge tag 'extcon-linus-for-3.13-rc2' of...

Merge tag 'extcon-linus-for-3.13-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/chanwoo/extcon into char-misc-linus

Chanwoo writes:

Update extcon for 3.13-rc2

This patchset fix NULL pointer error of extcon-arizona driver and fix issue
about memory of device groups when calling extcon_dev_unregister function.