libcamera: v4l2_subdevice: Rework enumPadSizes()

Align the enumPadSizes() interface and implementation with that of
enumPadCodes(). There is no functional change.

Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

src/libcamera/include/v4l2_subdevice.h

@@ -58,8 +58,8 @@ protected:
 
 private:
 	std::vector<unsigned int> enumPadCodes(unsigned int pad);
-	int enumPadSizes(unsigned int pad, unsigned int code,
-			 std::vector<SizeRange> *size);
+	std::vector<SizeRange> enumPadSizes(unsigned int pad,
+					    unsigned int code);
 
 	int setSelection(unsigned int pad, unsigned int target,
 			 Rectangle *rect);