Commit c65bde7b1e introduced a regression where under certain
circumstances `front` may be NULL, thus leading to a crash. It's not
currently known what exactly causes `front` to become NULL, nor we can
revert the offending commit, because there had been too many unrelated
changes that now depend on this commit.
So until someone comes up with a proper fix, let's add a workaround so
instead of crashing we just return from the function early.
This commit was tested with the bug `8982` and helps with the crash
with no other noticeable problems.
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/8982
Fixes: c65bde7b1e ("frontend/dri: inline __DRIdrawable in dri_drawable, make __DRIdrawable opaque")
Cc: mesa-stable
Signed-off-by: Konstantin Kharlamov <Hi-Angel@yandex.ru>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/23093>
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