Fix misc. MinGW and Valgrind warnings

src/localplayer.cpp

@@ -42,6 +42,7 @@ LocalPlayer::LocalPlayer(IGameDef *gamedef, const char *name):
 	last_pitch(0),
 	last_yaw(0),
 	last_keyPressed(0),
+	camera_impact(0.f),
 	last_animation(NO_ANIM),
 	hotbar_image(""),
 	hotbar_selected_image(""),

src/minimap.cpp

@@ -216,6 +216,8 @@ Mapper::Mapper(IrrlichtDevice *device, Client *client)
 	this->m_shdrsrc = client->getShaderSource();
 	this->m_ndef    = client->getNodeDefManager();
 
+	m_angle = 0.f;
+
 	// Initialize static settings
 	m_enable_shaders = g_settings->getBool("enable_shaders");
 	m_surface_mode_scan_height =

src/threading/thread.cpp

@@ -264,7 +264,8 @@ DWORD WINAPI Thread::threadProc(LPVOID param)
 	thr->m_running = false;
 	g_logger.deregisterThread();
 
-	return NULL;
+	// 0 is returned here to avoid an unnecessary ifdef clause
+	return 0;
 }
 
 

src/util/serialize.cpp

@@ -229,7 +229,7 @@ std::string deSerializeLongString(std::istream &is)
 
 	Buffer<char> buf2(s_size);
 	is.read(&buf2[0], s_size);
-	if (is.gcount() != s_size)
+	if ((u32)is.gcount() != s_size)
 		throw SerializationError("deSerializeLongString: couldn't read all chars");
 
 	s.reserve(s_size);