CVE ID:	CVE-2021-47534
Description:	In the Linux kernel, the following vulnerability has been resolved: drm/vc4: kms: Add missing drm_crtc_commit_put Commit 9ec03d7f1ed3 ("drm/vc4: kms: Wait on previous FIFO users before a commit") introduced a global state for the HVS, with each FIFO storing the current CRTC commit so that we can properly synchronize commits. However, the refcounting was off and we thus ended up leaking the drm_crtc_commit structure every commit. Add a drm_crtc_commit_put to prevent the leakage.
Test IDs:	None available
Cross References:	Common Vulnerability Exposure (CVE) ID: CVE-2021-47534 https://git.kernel.org/stable/c/049cfff8d53a30cae3349ff71a4c01b7d9981bc2 https://git.kernel.org/stable/c/049cfff8d53a30cae3349ff71a4c01b7d9981bc2 https://git.kernel.org/stable/c/53f9601e908d42481addd67cdb01a9288c611124 https://git.kernel.org/stable/c/53f9601e908d42481addd67cdb01a9288c611124