libxfs: don't touch buffer log item pointer when flushing inode log item

libxfs: don't touch buffer log item pointer when flushing inode log item

When we're flushing an inode log item, it is not necessary to mess with
the inode cluster buffer's log item because the iflush code paths pass
the inode log item directly.  The unconditional reset causes us to leak
buffer log items.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Bill O'Donnell <billodo@redhat.com>
Reviewed-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>