uinput: report errors from configuration ioctls

This came in useful when debugging the evemu support, and seems like
something we should be checking anyway.

Bug: 302297266
Test: pass some invalid arguments (e.g. large numbers that aren't valid
      event codes) to the ioctls, check errors are logged
Change-Id: Id3e32dad96c9db8819009b815ee2574ef63e96f7