glx/apple: Fixed glx context memory leak in case of failure.
glx/apple: Fixed glx context memory leak in case of failure.

Reviewed-by: Kristian Høgsberg <ca9b5b1e27d4fa7f4ba6848bdd08ca52cfd6330c@bitplanet.net>
Reviewed-by: Jeremy Huddleston Sequoia: <db3cec0cba09acb9cf8fd8bd399a3b27498cf883@apple.com>

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