[Bug 763602] validate: Fix overflow seek position comparision

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=763602

--- Comment #1 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
Created attachment 323848
  --> https://bugzilla.gnome.org/attachment.cgi?id=323848&action=edit
validate: Fix overflow seek position comparision

MAX(0, ((gint64) priv->segment_start - priv->seek_pos_tol) will be a high
positive number thanks to being interpreted as unsigned values if
segment_start < seek_pos_tol. Fix this by explicitly checking for this case
and only doing the subtraction otherwise.

This fixes the problem from fdccffbb2e5885b3f8e7369cdbda45b6717ffab0
completely now.

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