Small memory leak on cairooverlay

[José Carlos Cazarin Filho]

Hello! I wrote a simple program that runs the cairooverlay plugin and then goes into a fakesink.
The draw callback just does a dummy drawing on the screen and returns.

I've run the program for one and a half hour, and I could see the RES field being reported by the top command increasing slowly during this time.

It started at 12484 and now it is at 30340.

This is running in an embedded target. Is this a know bug of the cairooverlay plugin?

Thanks!
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