linux-imx

ext4: use sync_inode_metadata() when syncing inode metadata

We have a dedicated interface to sync inode metadata.  Use it to
simplify ext4's code some.

Signed-off-by: Guo Chao <yan@linux.vnet.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Reviewed-by: Lukas Czerner <lczerner@redhat.com>