Better fix for marking fs err in superblock if err set in journal superblock.

Better fix for marking fs err in superblock if err set in journal superblock.

The previous fix of flushing out the superblock after setting the
EXT2_ERROR_FS flag was erroneous because running the journal could have
updated the superblock (but not the in-memory copy the code referenced).
So instead, check the journal error conditions after running the journal
and freeing and re-opening the filesystem.  Also, make sure to flush
the error state of the superblock to disk before clearing the error state
of the journal.

Change-Id: Ia5cde1a367d86992c9bd3bca652a1289935d1380