ocfs2/dlm: use GFP_ATOMIC inside a spin_lock

My static checker complains that this is called with a spin_lock held
in dlm_master_requery_handler() from dlmrecovery.c.  Probably the reason
we have not received any bug reports about this is that recovery is not
a common operation.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Joel Becker <jlbec@evilplan.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>