[Backport to 1.20] glx: Fix use after free in MakeCurrent
The fix from commit c468d34c - "glx: Set ContextTag for all contexts" is actually incomplete, it correctly sets the context tag for direct contexts as well, but would fail to mark the context's currentClient.
As a result, when the context is destroyed, it would be freed immediately rather than being just scheduled for deletion, even though it is still current for some client. leading to a use-after-free.
Make sure to also set the context's currentClient for direct contexts as well, not just indirect ones.
Signed-off-by: Olivier Fourdan email@example.com Fixes: c468d34c - "glx: Set ContextTag for all contexts" Closes: #1186 (closed) Reviewed-by: Adam Jackson firstname.lastname@example.org (cherry picked from commit aad61e8e)