power: Make EVIOCPHYS non-fatal if it returns ENOENT

Some input devices don't have any value for EVIOCPHYS. In this case, the
call fails with ENOENT. We should still allow these devices to be used
(with phys of "Unknown").

BUG=none
TEST=build & install

Change-Id: Ie41e2c9fc91523919b604d95a84824c47b2b74e4
Reviewed-on: https://chromium-review.googlesource.com/201560
Reviewed-by: Daniel Erat <derat@chromium.org>
Commit-Queue: Michael Spang <spang@chromium.org>
Tested-by: Michael Spang <spang@chromium.org>
1 file changed