i965: Remove early release of DRI2 miptree
intel_update_winsys_renderbuffer_miptree() will release the existing miptree when wrapping a new DRI2 buffer, so we can remove the early release and so prevent a NULL mt dereference should importing the new DRI2 name fail for any reason. (Reusing the old DRI2 name will result in the rendering going astray, to a stale buffer, and not shown on the screen, but it allows us to issue a warning and not crash much later in innocent code.) Signed-off-by:Chris Wilson <chris@chris-wilson.co.uk> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=86281 Reviewed-by:
Martin Peres <martin.peres@linux.intel.com> Reviewed-by:
Chad Versace <chad.versace@intel.com>
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