Fix audio engine's float to S24 conversion

audioengine-fix-24bit-pcm.diff

diff -aur --unidirectional-new-file a/xbmc/cores/AudioEngine/Utils/AEConvert.cpp b/xbmc/cores/AudioEngine/Utils/AEConvert.cpp
--- a/xbmc/cores/AudioEngine/Utils/AEConvert.cpp  2013-01-28 03:07:32.000000000 +0100
+++ b/xbmc/cores/AudioEngine/Utils/AEConvert.cpp	2013-03-17 13:01:25.000000000 +0100
@@ -837,7 +837,7 @@
   _mm_empty();
   #else /* no SSE */
   for (uint32_t i = 0; i < samples; ++i)
-    *dst++ = (safeRound(*data++ * ((float)INT24_MAX+.5f)) & 0xFFFFFF) << 8;
+    *dst++ = safeRound(*data++ * ((float)INT24_MAX+.5f)) & 0x00FFFFFF;
   #endif
 
   return samples << 2;