igt/kms_fbcon_fbt: Handle ENODEV when checking i915_fbc_info for chipset support

If the machine doesn't support FBC, it will return -ENODEV from
i915_fbc_info, which we want to interpret as unsupported.

Reported-by: Marta Lofstedt<marta.lofstedt@intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Marta Lofstedt<marta.lofstedt@intel.com>
1 file changed