Fix the signature of ff_set_min_dist_lsf() to match the implementation

and add doxy for the size parameter.

Originally committed as revision 23986 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/lsp.h

@@ -48,8 +48,9 @@ void ff_acelp_reorder_lsf(int16_t* lsfq, int lsfq_min_distance, int lsfq_min, in
  *
  * @param lsf            [in,out] LSFs in Hertz
  * @param min_spacing    minimum distance between two consecutive lsf values
+ * @param size           size of the lsf vector
  */
-void ff_set_min_dist_lsf(float *lsf, double min_spacing, int order);
+void ff_set_min_dist_lsf(float *lsf, double min_spacing, int size);
 
 /**
  * \brief Convert LSF to LSP