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)						\