gfs: constify xattr_handler

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --cc fs/gfs2/acl.c
Simple merge

diff --cc fs/gfs2/acl.h
Simple merge

diff --cc fs/gfs2/super.h
Simple merge

diff --cc fs/gfs2/xattr.c
Simple merge