libcamera: Remove space between empty curly brackets

Remove spaces between empty curly brackets (replacing { } with {}) to
comply with the coding style. Fix one other coding style violation on
the lines touched by those fixes.

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

test/libtest/test.h

@@ -26,7 +26,7 @@ public:
 protected:
 	virtual int init() { return 0; }
 	virtual int run() = 0;
-	virtual void cleanup() { }
+	virtual void cleanup() {}
 };
 
 #define TEST_REGISTER(klass)						\

test/media_device/media_device_print_test.cpp

@@ -26,13 +26,13 @@ using namespace std;
 class MediaDevicePrintTest : public Test
 {
 public:
-	MediaDevicePrintTest() { }
-	~MediaDevicePrintTest() { }
+	MediaDevicePrintTest() {}
+	~MediaDevicePrintTest() {}
 
 protected:
 	int init() { return 0; }
 	int run();
-	void cleanup() { }
+	void cleanup() {}
 
 private:
 	int testMediaDevice(string deviceNode);
@@ -137,7 +137,7 @@ int MediaDevicePrintTest::run()
 	 */
 	for (i = 0; i < MAX_MEDIA_DEV; i++) {
 		string mediadev = deviceNode + to_string(i);
-		struct stat pstat = { };
+		struct stat pstat = {};
 
 		if (stat(mediadev.c_str(), &pstat))
 			continue;