Update environment variable for multi-user.

Bug: 7260040
Change-Id: I96d821e11a3f0be32bfe92a4151f00f2b15d100e
diff --git a/cryptfs.c b/cryptfs.c
index b2499aa..87ab281 100644
--- a/cryptfs.c
+++ b/cryptfs.c
@@ -1192,7 +1192,7 @@
     acquire_wake_lock(PARTIAL_WAKE_LOCK, lockid);
 
     /* Get the sdcard mount point */
-    sd_mnt_point = getenv("MULTIUSER_EXTERNAL_STORAGE");
+    sd_mnt_point = getenv("EMULATED_STORAGE_SOURCE");
     if (!sd_mnt_point) {
        sd_mnt_point = getenv("EXTERNAL_STORAGE");
     }