drm/i915: invert the verbosity of intel_enable_fbc
We currently print a DRM_DEBUG_KMS message on the happy path and don't print anything on the "failed to allocate" path. On some desktop environments (e.g., Unity) I see the "scheduling delayed FBC enable" thousands and thousands of times on my dmesg. So kill the useless message for the happy case, saving a lot of dmesg space, and properly signal the "kzalloc fail" case. Signed-off-by: NPaulo Zanoni <paulo.r.zanoni@intel.com> Reviewed-by: NZoltan Nyul <zoltan.nyul@intel.com> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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