SystemUI: Fix broken null check login in UsbStorageActivity

Summary: This is straight from upstream guys. Shameful!

Test Plan: merge soon, who knows what all this could break

Reviewers: synergy, anders3408, jriordan001, raymanfx, donald.munn, rlasalle15

Differential Revision: http://review.codefirex.com/D397
update AVRCP.kl for extra RC keycode

Summary: extra keycode for fast forware

Test Plan: merge

Reviewers: synergy, anders3408, jriordan001, raymanfx, donald.munn, rlasalle15

Differential Revision: http://review.codefirex.com/D399