Subsample out->p.h correctly in dav1d_apply_grain
Subsample out->p.h correctly in dav1d_apply_grain

The height of the chroma planes should be calculated as
(out->p.h + ss_ver) >> ss_ver, not out->p.h >> ss_ver.

This bug was reported in https://crbug.com/1201074. The bug can be
detected by decoding an AVIF image of size 228x1 that has film grain
synthesis under MemorySanitizer. MemorySanitizer reports a
use-of-uninitialized-value error when we read the U plane at index 64.

videolan/dav1d