[Bug 752041] ximagesink: fix navigation event leak

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=752041

--- Comment #3 from Vineeth <vineeth.tm at samsung.com> ---
It is basically a leak fix of event variable..

Event is being created in the beginning and when there is no xwindow, it just
returns without being freed..

There is no need to create event in the beginning, so moving the same down,
when it is needed.. thus it won't  leak when it returns for no xwindow..

And the whole functionality is needed input when pad is present. Hence adding
the whole functionality inside the if condition.

The change is actually similar to the code already present in xvimagesink

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