Minor fixes for warnings found by gcc undefined behavior sanitizer.

src/CMakeLists.txt

@@ -87,6 +87,7 @@ else(WIN32)
 
   if ( ${ASAN_ENABLE} )
 	add_definitions( -fsanitize=address -fsanitize=bounds-strict )
+	add_definitions( -fsanitize=undefined -fno-sanitize=vptr )
 	set( ASAN_LDFLAGS  -lasan -lubsan)
 	message( STATUS "Address Sanitizer Enabled" )
   else()

src/drivers/Qt/ppuViewer.cpp

@@ -1133,7 +1133,7 @@ void ppuPatternView_t::paintEvent(QPaintEvent *event)
 
 	xx = 0; yy = 0;
 
-	showSelector = (cycleCount < 20);
+	showSelector = (cycleCount < 20) && (selTile.x() >= 0) && (selTile.y() >= 0);
 
 	if ( mode == 1 )
 	{

src/movie.cpp

@@ -409,6 +409,7 @@ MovieData::MovieData()
 	, rerecordCount(0)
 	, binaryFlag(false)
 	, loadFrameCount(-1)
+	, fourscore(false)
 	, microphone(false)
 	, RAMInitOption(0)
 	, RAMInitSeed(0)