fs_mgr.cpp: fix the problem that the casefold feature not enabled for the data partition

The value of entry.mount_point for data partition is "/data"

Fixes: 5ba5b90cd6a3 ("fs_mgr: try tune2fs for casefolding on /data only")

Test: got "Can't mount with encoding and encryption" problem reported
      by the db845c build with the default 5.4.38 prebuilt kernel

Signed-off-by: Yongqin Liu <yongqin.liu@linaro.org>
Change-Id: I226a2275f5f2ee18503c5a3863ef5a1d2c2ed7be
diff --git a/fs_mgr/fs_mgr.cpp b/fs_mgr/fs_mgr.cpp
index 5ff01e1..fe72393 100644
--- a/fs_mgr/fs_mgr.cpp
+++ b/fs_mgr/fs_mgr.cpp
@@ -527,7 +527,7 @@
     bool wants_casefold =
             android::base::GetBoolProperty("external_storage.casefold.enabled", false);
 
-    if (entry.mount_point != "data" || !wants_casefold || has_casefold ) return;
+    if (entry.mount_point != "/data" || !wants_casefold || has_casefold) return;
 
     std::string casefold_support;
     if (!android::base::ReadFileToString(SYSFS_EXT4_CASEFOLD, &casefold_support)) {