libcamera: Remove unneeded semicolons

Comply with the coding style by removing lots of unneeded semicolons.
Fix a few other coding style violations on the lines touched by those
fixes.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

test/v4l2_subdevice/v4l2_subdevice_test.h

@@ -21,7 +21,9 @@ class V4L2SubdeviceTest : public Test
 {
 public:
 	V4L2SubdeviceTest()
-		: scaler_(nullptr){};
+		: scaler_(nullptr)
+	{
+	}
 
 protected:
 	int init() override;