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Immediately free pitch-shifted sound effects

When we stop playing a sound effect on a channel, check to see
whether it is a pitch-shifted sound effect and whether it's not
used on any other channel. If so, immediately free it.

--- a/src/i_sdlsound.c

+++ b/src/i_sdlsound.c

@@ -350,6 +350,13 @@

     channels_playing[channel] = NULL;

     UnlockAllocatedSound(snd);

+

+    // if the sound is a pitch-shift and it's not in use, immediately

+    // free it

+    if(snd->pitch != NORM_PITCH && snd->use_count <= 0)

+    {

+        FreeAllocatedSound(snd);

+    }

 }

 #ifdef HAVE_LIBSAMPLERATE