drm/amdgpu/display bail early in dm_pp_get_static_clocks

If there are no supported callbacks.  We'll fall back to the
nominal clocks.

Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1170Reviewed-by: Evan Quan <evan.quan@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_pp_smu.c

@@ -530,6 +530,8 @@ bool dm_pp_get_static_clocks(
 			&pp_clk_info);
 	else if (adev->smu.ppt_funcs)
 		ret = smu_get_current_clocks(&adev->smu, &pp_clk_info);
+	else
+		return false;
 	if (ret)
 		return false;