Description: drm/meson: fix memory leak on ->hpd_notify callback
References:
Notes:
 carnil> Introduced in 0af5e0b41110 ("drm/meson: encoder_hdmi: switch to bridge
 carnil> DRM_BRIDGE_ATTACH_NO_CONNECTOR"). Vulnerable versions: 5.15.61 5.17-rc1.
Bugs:
upstream: released (6.6-rc3) [099f0af9d98231bb74956ce92508e87cbcb896be]
6.7-upstream-stable: N/A "Fixed before branching point"
6.6-upstream-stable: N/A "Fixed before branching point"
6.1-upstream-stable: released (6.1.56) [ee335e0094add7fc2c7034e0534e1920d61d2078]
5.10-upstream-stable: N/A "Vulnerable code not present"
4.19-upstream-stable: N/A "Vulnerable code not present"
sid: released (6.5.6-1)
6.1-bookworm-security: released (6.1.64-1)
5.10-bullseye-security: N/A "Vulnerable code not present"
4.19-buster-security: N/A "Vulnerable code not present"