hevc: remove useless clip in FUNC(sao_band_filter)()

The src buffer should only contain values in the interval
[0, (1 << BIT_DEPTH) - 1]. Since shift = (BIT_DEPTH - 5), src[x] >> shift
must be in the interval [0, 31], so no clip is needed.

This removes the code that was changed in 5856bca3
as the clip that was repositioned in that commit is removed
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/hevcdsp_template.c

@@ -395,7 +395,7 @@ static void FUNC(sao_band_filter)(uint8_t *_dst, uint8_t *_src,
         offset_table[(k + sao_left_class) & 31] = sao_offset_val[k + 1];
     for (y = 0; y < height; y++) {
         for (x = 0; x < width; x++)
-            dst[x] = av_clip_pixel(src[x] + offset_table[av_clip_pixel(src[x]) >> shift]);
+            dst[x] = av_clip_pixel(src[x] + offset_table[src[x] >> shift]);
         dst += stride;
         src += stride;
     }