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drm/xe/fbc: set compressed_fb to NULL on error

Matthew Auld requested to merge mwa/kernel:xe-fbc-fix into xe

On DG2 we get a massive flood of the following:

[ 1068.790446] xe 0000:03:00.0: drm_WARN_ON((!!(fbc->compressed_fb)))
[ 1068.790465] WARNING: CPU: 9 PID: 637 at drivers/gpu/drm/xe/display/intel_fbc.c:843 intel_fbc_update+0x605/0x670 [xe]

Signed-off-by: Matthew Auld matthew.auld@intel.com

Edited by Matthew Auld

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