lc-compliance: Initialize the event loop pointer

The event loop pointer loop_ was not initialized. This has no effect on
the current code flow but could in the future lead to hard debug
problems.

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

src/lc-compliance/simple_capture.cpp

@@ -10,7 +10,8 @@
 using namespace libcamera;
 
 SimpleCapture::SimpleCapture(std::shared_ptr<Camera> camera)
-	: camera_(camera), allocator_(std::make_unique<FrameBufferAllocator>(camera))
+	: loop_(nullptr), camera_(camera),
+	  allocator_(std::make_unique<FrameBufferAllocator>(camera))
 {
 }