[Bug 760479] basesrc: Only respond to duration/position queries if the quantity is valid

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=760479

--- Comment #2 from Carlos Rafael Giani <dv at pseudoterminal.org> ---
Actually, that is an excellent question :) I dug further, and as it turns out,
there was one custom sink element in the application here that didn't check the
gst_element_query() return value, assuming that it always succeeds. Still, I
think the patch is valid. I'll update the commit message.

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