Fix kSystemExtVintfDir.

Consistent with other variables.

Test: pass
Change-Id: Ie30cce960ddea5b161a390b5d6e203a9e8a28c96
diff --git a/VintfObject.cpp b/VintfObject.cpp
index fe57152..c13dc64 100644
--- a/VintfObject.cpp
+++ b/VintfObject.cpp
@@ -556,7 +556,7 @@
 const std::string kVendorVintfDir = "/vendor/etc/vintf/";
 const std::string kOdmVintfDir = "/odm/etc/vintf/";
 const std::string kProductVintfDir = "/product/etc/vintf/";
-const std::string kSystemExtVintfDir = "/system_ext/etc/vintf";
+const std::string kSystemExtVintfDir = "/system_ext/etc/vintf/";
 
 const std::string kVendorManifest = kVendorVintfDir + "manifest.xml";
 const std::string kSystemManifest = kSystemVintfDir + "manifest.xml";