vulkan: adjust code styling

src/common/math.h

@@ -70,10 +70,6 @@ struct Rect
 	{
 		return x == rhs.x && y == rhs.y && w == rhs.w && h == rhs.h;
 	}
-
-	bool operator != (const Rect& rhs) const {
-		return !(*this == rhs);
-	}
 };
 
 inline int nextP2(int x)

src/common/runtime.h

@@ -673,8 +673,7 @@ int luax_catchexcept(lua_State *L, const T& func)
 	catch (const std::exception &e)
 	{
 		should_error = true;
-		const char* msg = e.what();
-		lua_pushstring(L, msg);
+		lua_pushstring(L, e.what());
 	}
 
 	if (should_error)