(release/25.1) modesetting: properly use fb_id of front_bo for reverse PRIME CRTC#2286
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When doing reverse PRIME, the buffer being scaned out is still the front BO. Properly reuse its fb_id, to prevent adding a FB for the front_bo each time the fb_id is requested. Signed-off-by: Icenowy Zheng <uwu@icenowy.me> Part-of: <https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/2064>
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When doing reverse PRIME, the buffer being scaned out is still the front
BO.
Properly reuse its fb_id, to prevent adding a FB for the front_bo each
time the fb_id is requested.
Signed-off-by: Icenowy Zheng uwu@icenowy.me
Part-of: https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/2064