Switch libnativehelper from statfs to statvfs.

Change-Id: I7b3aa8fedc1749d4428ad0df792b6fb8c00030b6
diff --git a/JniConstants.cpp b/JniConstants.cpp
index 6c3b9aa..3c9fd58 100644
--- a/JniConstants.cpp
+++ b/JniConstants.cpp
@@ -65,7 +65,7 @@
 jclass JniConstants::structPasswdClass;
 jclass JniConstants::structPollfdClass;
 jclass JniConstants::structStatClass;
-jclass JniConstants::structStatFsClass;
+jclass JniConstants::structStatVfsClass;
 jclass JniConstants::structTimevalClass;
 jclass JniConstants::structUcredClass;
 jclass JniConstants::structUtsnameClass;
@@ -127,7 +127,7 @@
     structPasswdClass = findClass(env, "libcore/io/StructPasswd");
     structPollfdClass = findClass(env, "libcore/io/StructPollfd");
     structStatClass = findClass(env, "libcore/io/StructStat");
-    structStatFsClass = findClass(env, "libcore/io/StructStatFs");
+    structStatVfsClass = findClass(env, "libcore/io/StructStatVfs");
     structTimevalClass = findClass(env, "libcore/io/StructTimeval");
     structUcredClass = findClass(env, "libcore/io/StructUcred");
     structUtsnameClass = findClass(env, "libcore/io/StructUtsname");