Follow input changes to proptools.CloneEmptyProperties

Test: m checkbuild
Change-Id: I1fd53d03722d134009f7ed663f05bd6dc5980dd1
diff --git a/android/hooks.go b/android/hooks.go
index e8cd81b..47f69d1 100644
--- a/android/hooks.go
+++ b/android/hooks.go
@@ -97,7 +97,7 @@
 			module.base().variableProperties,
 			// Put an empty copy of the src properties into dst so that properties in src that are not in dst
 			// don't cause a "failed to find property to extend" error.
-			proptools.CloneEmptyProperties(reflect.ValueOf(src).Elem()).Interface(),
+			proptools.CloneEmptyProperties(reflect.ValueOf(src)).Interface(),
 		}
 		err := proptools.AppendMatchingProperties(dst, src, nil)
 		if err != nil {