Decrease doom's code size and some code cleanup.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@9690 a1c6a512-1295-4272-9138-f99709370657

apps/plugins/doom/i_sound.c

@@ -62,7 +62,7 @@
 //  Basically, samples from all active internal channels
 //  are modifed and added, and stored in the buffer
 //  that is submitted to the audio device.
-signed short mixbuffer[MIXBUFFERSIZE];
+signed short *mixbuffer=NULL;
 
 typedef struct {
    // SFX id of the playing sound effect.
@@ -516,6 +516,9 @@ void I_InitSound()
 
    printf( " pre-cached all sound data\n");
 
+   if(mixbuffer==NULL)
+      mixbuffer=malloc(sizeof(short)*MIXBUFFERSIZE);
+
    // Now initialize mixbuffer with zero.
    for ( i = 0; i< MIXBUFFERSIZE; i++ )
       mixbuffer[i] = 0;