Description: drm/amd/display: Fix MST Null Ptr for RV
References:
Notes:
 carnil> First introducing commit could not be determined.
Bugs:
upstream: released (6.8-rc4) [e6a7df96facdcf5b1f71eb3ec26f2f9f6ad61e57]
6.7-upstream-stable: released (6.7.6) [5cd7185d2db76c42a9b7e69adad9591d9fca093f]
6.6-upstream-stable: released (6.6.18) [7407c61f43b66e90ad127d0cdd13cbc9d87141a5]
6.1-upstream-stable: released (6.1.82) [01d992088dce3945f70f49f34b0b911c5213c238]
5.10-upstream-stable: needed
4.19-upstream-stable: needed
sid: released (6.7.7-1)
6.1-bookworm-security: released (6.1.82-1)
5.10-bullseye-security: needed
4.19-buster-security: needed