restorecon top-level entries under /data/user.

/data/user has a set of top-level entries including the /data/user/0
symlink and the /data/user/N subdirectories for secondary users that
need to be relabeled on upgrades from 4.2 with unlabeled userdata.
Only set the flag to skip on subdirectories of /data/user, not on
/data/user itself.

Change-Id: I7a4c7ede74daa249db654963ba49585755c9b04e
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
diff --git a/src/android.c b/src/android.c
index 18c5da9..02ac063 100644
--- a/src/android.c
+++ b/src/android.c
@@ -1178,7 +1178,7 @@
             }
             if (!datadata &&
                 (!strcmp(ftsent->fts_path, DATA_DATA_PATH) ||
-                 !strcmp(ftsent->fts_path, DATA_USER_PATH))) {
+                 !strncmp(ftsent->fts_path, DATA_USER_PREFIX, sizeof(DATA_USER_PREFIX)-1))) {
                 // Don't label anything below this directory.
                 fts_set(fts, ftsent, FTS_SKIP);
                 // but fall through and make sure we label the directory itself