fs_msg: fix bad tmpfs detection (fix /persist mount errors)

Without this, the wrong mount point is flagged as being mounted.
Which leads to:

<6>[    3.278040] fs_mgr: __mount(source=/dev/block/platform/msm_sdcc.1/by-name/userdata,target=/data,type=ext4)=-1
<7>[    3.278834] SELinux: initialized (dev tmpfs, type tmpfs), uses transition SIDs
<6>[    3.278925] fs_mgr: fs_mgr_mount_all(): skipping fstab dup mountpoint=/persist rec[3].fs_type=ext4 already mounted.


Bug: 15925030
Bug: 15976144
Change-Id: I0bc617f11dfc97c32bb2d0e52b94ec19282568eb
diff --git a/fs_mgr/fs_mgr.c b/fs_mgr/fs_mgr.c
index ab3c5a6..e9b4125 100644
--- a/fs_mgr/fs_mgr.c
+++ b/fs_mgr/fs_mgr.c
@@ -371,7 +371,7 @@
                     ++error_count;
                     continue;
                 }
-                last_ok_mount_point = fstab->recs[j].mount_point;
+                last_ok_mount_point = fstab->recs[i].mount_point;
             }
             encryptable = 1;
         } else {