More OKed parts of the QCELP decoder

patch by Kenan Gillet, kenan.gillet gmail com

Originally committed as revision 15973 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/qcelpdata.h

@@ -58,6 +58,10 @@ typedef struct {
      */
     uint8_t lspv[10];
 
+    /**
+     * reserved bits only present in bitrate 1, 1/4 and 1/8 packets
+     */
+    uint8_t reserved;
 } QCELPFrame;
 
 /**