fs_mgr: fix double mounting of partition

When looking for partitions to encrypt, it would setup a tmpfs
onto the mount point. But with multi-type mount points it would
repeat the mount.
This would lead to having and extra tmpfs mounted on /data, as
only one would get removed.

Change-Id: I28f2c2c4955906f1172342ea07e0795d6880986b
Signed-off-by: JP Abgrall <jpa@google.com>
diff --git a/fs_mgr/fs_mgr.c b/fs_mgr/fs_mgr.c
index 4feb921..4fad6ad 100644
--- a/fs_mgr/fs_mgr.c
+++ b/fs_mgr/fs_mgr.c
@@ -364,6 +364,7 @@
                     ++error_count;
                     continue;
                 }
+                last_ok_mount_point = fstab->recs[j].mount_point;
             }
             encryptable = 1;
         } else {