apps: cam: drm: Drop unneeded local variable

The planes variable in the Device::createFrameBuffer() function is a
reference to buffer.planes() that is only used as a range initializer in
a range-based for loop. Use buffer.planes() directly and drop the
variable.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Barnabás Pőcze <barnabas.pocze@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>

src/apps/cam/drm.cpp

@@ -659,10 +659,8 @@ std::unique_ptr<FrameBuffer> Device::createFrameBuffer(
 	uint32_t offsets[4] = {};
 	int ret;
 
-	const std::vector<libcamera::FrameBuffer::Plane> &planes = buffer.planes();
-
 	unsigned int i = 0;
-	for (const libcamera::FrameBuffer::Plane &plane : planes) {
+	for (const libcamera::FrameBuffer::Plane &plane : buffer.planes()) {
 		int fd = plane.fd.get();
 		uint32_t handle;