Make sure the sound decoders are closed when they're finished with

apps/openmw/mwsound/ffmpeg_decoder.cpp

@@ -36,6 +36,7 @@ FFmpeg_Decoder::FFmpeg_Decoder()
 
 FFmpeg_Decoder::~FFmpeg_Decoder()
 {
+    Close();
 }
 
 }

apps/openmw/mwsound/mpgsnd_decoder.cpp

@@ -118,6 +118,7 @@ MpgSnd_Decoder::MpgSnd_Decoder() : sndFile(NULL), mpgFile(NULL)
 
 MpgSnd_Decoder::~MpgSnd_Decoder()
 {
+    Close();
 }
 
 }

apps/openmw/mwsound/openal_output.cpp

@@ -332,6 +332,7 @@ Sound* OpenAL_Output::playSound(const std::string &fname, float volume, float pi
     try
     {
         buf = LoadBuffer(decoder);
+        decoder->Close();
         alGenSources(1, &src);
         throwALerror();
     }
@@ -380,6 +381,7 @@ Sound* OpenAL_Output::playSound3D(const std::string &fname, const float *pos, fl
     try
     {
         buf = LoadBuffer(decoder);
+        decoder->Close();
         alGenSources(1, &src);
         throwALerror();
     }