Fix memory leak with audio stream not been released

SFileChunk was not been release.

3rdParty/Storm/Source/storm.h

@@ -200,6 +200,7 @@ BOOL STORMAPI SFileCloseArchive(HANDLE hArchive);
 BOOL STORMAPI SFileCloseFile(HANDLE hFile);
 
 BOOL STORMAPI SFileDdaBeginEx(HANDLE hFile, DWORD flags, DWORD mask, unsigned __int32 lDistanceToMove, signed __int32 volume, signed int pan, int a7);
+void SFileFreeChunk();
 BOOL STORMAPI SFileDdaDestroy();
 BOOL STORMAPI SFileDdaEnd(HANDLE hFile);
 BOOL STORMAPI SFileDdaGetPos(HANDLE hFile, DWORD *current, DWORD *end);

Source/effects.cpp

@@ -920,6 +920,7 @@ void sfx_stop()
 	if (sfx_stream) {
 		SFileDdaEnd(sfx_stream);
 		SFileCloseFile(sfx_stream);
+		SFileFreeChunk();
 		sfx_stream = NULL;
 		sfx_data_cur = NULL;
 	}

SourceX/storm/storm.cpp

@@ -103,6 +103,12 @@ BOOL SFileDdaBeginEx(HANDLE hFile, DWORD flags, DWORD mask, unsigned __int32 lDi
 	return true;
 }
 
+void SFileFreeChunk()
+{
+	if(SFileChunk)
+		Mix_FreeChunk(SFileChunk);
+}
+
 BOOL SFileDdaDestroy()
 {
 	Mix_FreeChunk(SFileChunk);