Avoid manipulating gf group lengths at end of sequence
Avoid manipulating gf group lengths at end of sequence

There will be no keyframe at the end of the sequence so there is
no reason to enforce the forward keyframe min gf group interval.

Change-Id: I81d5848c3c5a111a13844d5a256b507043ae35be

GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom