GFS2: Use GFP_NOFS for alloc structure

This is called under a glock, so its a good plan to use GFP_NOFS
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

fs/gfs2/rgrp.c

@@ -911,7 +911,7 @@ void gfs2_rgrp_repolish_clones(struct gfs2_rgrpd *rgd)
 struct gfs2_alloc *gfs2_alloc_get(struct gfs2_inode *ip)
 {
 	BUG_ON(ip->i_alloc != NULL);
-	ip->i_alloc = kzalloc(sizeof(struct gfs2_alloc), GFP_KERNEL);
+	ip->i_alloc = kzalloc(sizeof(struct gfs2_alloc), GFP_NOFS);
 	return ip->i_alloc;
 }