avcodec/hevcdsp_template: Fix undefined shift

Fixes: runtime error: left shift of negative value -255
Fixes: 3373/clusterfuzz-testcase-minimized-5604083912146944

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavcodec/hevcdsp_template.c

@@ -1486,7 +1486,7 @@ static void FUNC(put_hevc_epel_bi_w_hv)(uint8_t *_dst, ptrdiff_t _dststride, uin
     for (y = 0; y < height; y++) {
         for (x = 0; x < width; x++)
             dst[x] = av_clip_pixel(((EPEL_FILTER(tmp, MAX_PB_SIZE) >> 6) * wx1 + src2[x] * wx0 +
-                                    ((ox0 + ox1 + 1) << log2Wd)) >> (log2Wd + 1));
+                                    ((ox0 + ox1 + 1) * (1 << log2Wd))) >> (log2Wd + 1));
         tmp  += MAX_PB_SIZE;
         dst  += dststride;
         src2 += MAX_PB_SIZE;