SizeClassInfo can return 0 even without an error

Catch the error case separately. Commit 19a9cd607d added length checking to
SizeClassInfo but re-used the return value of 0 for an error. A device without
classes (as is initialized by xf86-input-libinput for tablets) can
legitimately return 0 and erroneously triggers an error.
Fix this by using a separate value for the error.

Reproducible by calling XListInputDevices() with a tablet attached.

This fixes a regression introduced in commit 19a9cd607d.

Signed-off-by: Niels Ole Salscheider <niels_ole@salscheider-online.de>
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>

0 files changed, 0 insertions, 0 deletions