Description: drm/amd/display: Add NULL test for 'timing generator' in 'dcn21_set_pipe()'
References:
Notes:
 carnil> Introduced in 474ac4a875ca ("drm/amd/display: Implement some asic specific abm
 carnil> call backs."). Vulnerable versions: 5.9-rc1.
Bugs:
upstream: released (6.8-rc4) [66951d98d9bf45ba25acf37fe0747253fafdf298]
6.7-upstream-stable: released (6.7.5) [39f24c08363af1cd945abad84e3c87fd3e3c845a]
6.6-upstream-stable: released (6.6.17) [3f3c237a706580326d3b7a1b97697e5031ca4667]
6.1-upstream-stable: needed
5.10-upstream-stable: needed
4.19-upstream-stable: N/A "Vulnerable code not present"
sid: released (6.7.7-1)
6.1-bookworm-security: needed
5.10-bullseye-security: needed
4.19-buster-security: N/A "Vulnerable code not present"