drm/amdkfd: Uninitialized pointer read

This a pointer that is being passed into other functions, so it is best to
initialize it to NULL prior.

Signed-off-by: Andrew Martin <[e-mail]>
Reviewed-by: Harish Kasiviswanathan <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/amdkfd/kfd_topology.c

···
 	struct amdgpu_cu_info *cu_info = &kdev->adev->gfx.cu_info;
 	struct amdgpu_gfx_config *gfx_info = &kdev->adev->gfx.config;
 	int gpu_processor_id;
-	struct kfd_cache_properties *props_ext;
+	struct kfd_cache_properties *props_ext = NULL;
 	int num_of_entries = 0;
 	int num_of_cache_types = 0;
 	struct kfd_gpu_cache_info cache_info[KFD_MAX_CACHE_TYPES];