drm/amd/display: Check dc_link before applying DSC policy

apply_dsc_policy_for_stream() decides whether Display Stream Compression
(DSC) should be enabled for a display stream based on display
capabilities, link bandwidth and user overrides.

Smatch reports that apply_dsc_policy_for_stream() dereferences
aconnector->dc_link before checking whether it is NULL.

Add an early NULL check for aconnector->dc_link before the first
dereference and remove the later redundant NULL check in the HDMI_FRL
path.

Fixes: 0e967e086e75 ("drm/amd/display: Extract connector and encoder code to amdgpu_dm_connector")
Reported-by: Dan Carpenter <error27@gmail.com>
Cc: Roman Li <roman.li@amd.com>
Cc: Alex Hung <alex.hung@amd.com>
Cc: Tom Chung <chiahsuan.chung@amd.com>
Cc: Aurabindo Pillai <aurabindo.pillai@amd.com>
Reviewed-by: George Zhang <george.zhang@amd.com>
Signed-off-by: Srinivasan Shanmugam <srinivasan.shanmugam@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

0 files changed, 0 insertions, 0 deletions