[Bug 748128] avfvideosrc: fix build failure with clang

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=748128

--- Comment #1 from Yujin Lee <saddopop at gmail.com> ---
Created attachment 301923
  --> https://bugzilla.gnome.org/attachment.cgi?id=301923&action=edit
avfvideosrc: fix build failure with clang

This commit fixes build failure by clang with [-Werror,-Wabsolute-value]
options.

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