drm/amd/pm: fix get dpm level count for yello carp

For invalid clk types, return -EINVAL to check the return.
Signed-off-by: Jesse Zhang <Jesse.Zhang@amd.com>
Reviewed-by: Yifan Zhang <yifan1.zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/pm/swsmu/smu13/yellow_carp_ppt.c

@@ -777,7 +777,7 @@ static int yellow_carp_get_dpm_level_count(struct smu_context *smu,
 		*count = clk_table->NumDfPstatesEnabled;
 		break;
 	default:
-		break;
+		return -EINVAL;
 	}
 
 	return 0;