cameras.xsd: crop width/height is either small negative offset or size.
cameras.xsd: crop width/height is either small negative offset or size.

Thanks to @schenlap for noticing that i totally botchered
Canon PowerShot G9 X Mark ii  camera support.

LebedevRI/rawspeed,LebedevRI/rawspeed,darktable-org/rawspeed,LebedevRI/rawspeed,darktable-org/rawspeed,LebedevRI/rawspeed,darktable-org/rawspeed,darktable-org/rawspeed,darktable-org/rawspeed,LebedevRI/rawspeed