use av_clip_int16() where it makes sense

Originally committed as revision 10078 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/dsicinav.c

@@ -325,7 +325,7 @@ static int cinaudio_decode_frame(AVCodecContext *avctx,
     }
     while (buf_size > 0) {
         cin->delta += cinaudio_delta16_table[*src++];
-        cin->delta = av_clip(cin->delta, -32768, 32767);
+        cin->delta = av_clip_int16(cin->delta);
         *samples++ = cin->delta;
         --buf_size;
     }