drm/amd/display: Add null check for head_pipe in dcn201_acquire_free_pipe_for_layer

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Add null check for head_pipe in dcn201_acquire_free_pipe_for_layer This commit addresses a potential null pointer dereference issue in the `dcn201_acquire_free_pipe_for_layer` function. The issue could occur when `head_pipe` is null. The fix adds a check to ensure `head_pipe` is not null before asserting it. If `head_pipe` is null, the function returns NULL to prevent a potential null pointer dereference. Reported by smatch: drivers/gpu/drm/amd/amdgpu/../display/dc/resource/dcn201/dcn201_resource.c:1016 dcn201_acquire_free_pipe_for_layer() error: we previously assumed 'head_pipe' could be null (see line 1010)

References

• https://git.kernel.org/stable/c/16ce8fd94da8599bb6f0496895d392a69aead1c0
• https://git.kernel.org/stable/c/390d757621f5f35d11a63ed7d9d3262ead240064
• https://git.kernel.org/stable/c/8a1b1655a490a492a5a6987254c935ecce4eb9de
• https://git.kernel.org/stable/c/f22f4754aaa47d8c59f166ba3042182859e5dff7