D7900: Error out if the device returns a negative number of buttons

[Albert Astals Cid]

aacid created this revision.
Restricted Application added a project: Plasma.
Restricted Application added a subscriber: plasma-devel.

REVISION SUMMARY
  btnx[1] is reporting a negative number of buttons in my machine (-87) so
  ignore it instead of crashing (once we have negative buttons things quite don't work),
  ignoring is not wrong since after all btnx is not a joystick
  
  [1] https://github.com/cdobrich/btnx

REPOSITORY
  R119 Plasma Desktop

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D7900

AFFECTED FILES
  kcms/hardware/joystick/joydevice.cpp

To: aacid
Cc: plasma-devel, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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