[Bug 789476] Segfault with gdp data

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=789476

--- Comment #4 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
Created attachment 367572
  --> https://bugzilla.gnome.org/attachment.cgi?id=367572&action=edit
gdpdepay: don't use allocator if it has custom alloc

gdpdepay element uses the decide_allocation to fetch the downstream
allocator. Nonetheless it is possible that allocate uses a custom
alloc function, which is not usable by gdpdepay, crashing later the
application when the allocater buffer is NULL.

This patch checks for the allocator flags and reset it if the
allocator has a custom alloc function.

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