libcamera: geometry: Set steps to 0 in default SizeRange constructor

The default SizeRange constructor initializes the min and max members,
but leaves the hStep and vStep members uninitialized. Fix it.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Umang Jain <email@uajain.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>

include/libcamera/geometry.h

@@ -71,6 +71,7 @@ class SizeRange
 {
 public:
 	SizeRange()
+		: hStep(0), vStep(0)
 	{
 	}