glx-fbconfig-sanity: memory leak

Merged Sergii Romantsov requested to merge GL/piglit:fix/meml_glx-fbconfig-sanity into master

Test uses a call GetVisualFromFBConfig. Resulting object has to be freed by XFree. Also screen has to be closed by XCloseDisplay otherwise a lot of objects allocated with screen-context will not be freed.

CC: Ian Romanick Signed-off-by: Sergii Romantsov

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