libcamera: pipeline: raspberrypi: Constify parameter to StaggeredCtrl::set()

The controls parameter of StaggeredCtrl::set(), passed by reference, is
not modified by the function. Make it const.

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

src/libcamera/pipeline/raspberrypi/staggered_ctrl.cpp

@@ -91,7 +91,7 @@ bool StaggeredCtrl::set(std::initializer_list<std::pair<const uint32_t, int32_t>
 	return true;
 }
 
-bool StaggeredCtrl::set(ControlList &controls)
+bool StaggeredCtrl::set(const ControlList &controls)
 {
 	std::lock_guard<std::mutex> lock(lock_);
 

src/libcamera/pipeline/raspberrypi/staggered_ctrl.h

@@ -41,7 +41,7 @@ public:
 
 	bool set(uint32_t ctrl, int32_t value);
 	bool set(std::initializer_list<std::pair<const uint32_t, int32_t>> ctrlList);
-	bool set(ControlList &controls);
+	bool set(const ControlList &controls);
 
 	int write();