Fix missing parens in CleanSpec.mk.

Change-Id: I0440a942d3e685d619ec9cc402d3293cb3f52df1
diff --git a/libs/gui/CleanSpec.mk b/libs/gui/CleanSpec.mk
index c062229..5a5144c 100644
--- a/libs/gui/CleanSpec.mk
+++ b/libs/gui/CleanSpec.mk
@@ -49,3 +49,4 @@
 # ************************************************
 $(call add-clean-step, find $(PRODUCT_OUT) -type f -name "libgui*" -print0 | xargs -0 rm -f)
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/obj/SHARED_LIBRARIES/libgui_intermediates)
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/obj/SHARED_LIBRARIES/libgui_intermediates)