kill check_acl callback of generic_permission()

its value depends only on inode and does not change; we might as
well store it in ->i_op->check_acl and be done with that.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/ocfs2/namei.c b/fs/ocfs2/namei.c
index e5d738c..33889dc 100644
--- a/fs/ocfs2/namei.c
+++ b/fs/ocfs2/namei.c
@@ -2498,4 +2498,5 @@
 	.listxattr	= ocfs2_listxattr,
 	.removexattr	= generic_removexattr,
 	.fiemap         = ocfs2_fiemap,
+	.check_acl	= ocfs2_check_acl,
 };