[FFmpeg-devel] Fix undefined behavior in ff_configure_buffers_for_index()

[Dale Curtis]

When e2_pts == INT64_MIN and e1_pts >= 0 the calculation of
e2_pts - e1_pts will overflow an int64_t. So instead check
for overflow and default to |time_tolerance| if the value
is too large for an int64_t.

Signed-off-by: Dale Curtis <dalecurtis at chromium.org>
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