libcamera: Use const reference for range loops

Use a const reference in range-based for loops to avoid copies of the
loop elements.

While at it, change looping over controls in
PipelineHandlerUVC::processControls to use structured bindings.

Signed-off-by: Christian Rauch <Rauch.Christian@gmx.de>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/libcamera/pipeline/vimc/vimc.cpp b/src/libcamera/pipeline/vimc/vimc.cpp
index 153cf849..d2f2e460 100644
--- a/src/libcamera/pipeline/vimc/vimc.cpp
+++ b/src/libcamera/pipeline/vimc/vimc.cpp
@@ -378,7 +378,7 @@ int PipelineHandlerVimc::processControls(VimcCameraData *data, Request *request)
 {
 	ControlList controls(data->sensor_->controls());
 
-	for (auto it : request->controls()) {
+	for (const auto &it : request->controls()) {
 		unsigned int id = it.first;
 		unsigned int offset;
 		uint32_t cid;