Encoder writes undecodable stream when an MFH OBU and frame resize are combined

[xinzhao-apple]

What version / commit were you testing with?

v1.0.0-101-g885b0a892

What steps will reproduce the problem?

1. Encode with MFH OBU signaling on and a resize that gives the key frame and the inter
   frames different coded sizes:

   ./avmenc --width=160 --height=172 --i420 --input-bit-depth=8 --bit-depth=8 \
            --cpu-used=4 --passes=1 --threads=1 --limit=3 --ivf \
            --resize-mode=1 --resize-denominator=8 --resize-kf-denominator=16 \
            --enable-mfh-obu-signaling=1 -o out.ivf noise_160x172.yuv

2. Decode it with the reference decoder:

   ./avmdec -o out.yuv out.ivf --rawvideo

Expected behavior

A stream just produced by the reference encoder decodes cleanly with the reference decoder.

Actual behavior

The encoder succeeds (exit 0) but the decoder fails on the first inter frame (exit 1):

Warning: Failed to decode frame 2: Corrupt frame detected
Warning: Additional information: Invalid value for EOB position token