constify dentry_operations: misc filesystems

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/isofs/inode.c b/fs/isofs/inode.c
index 6147ec3..13d2edd 100644
--- a/fs/isofs/inode.c
+++ b/fs/isofs/inode.c
@@ -114,7 +114,7 @@
 };
 
 
-static struct dentry_operations isofs_dentry_ops[] = {
+static const struct dentry_operations isofs_dentry_ops[] = {
 	{
 		.d_hash		= isofs_hash,
 		.d_compare	= isofs_dentry_cmp,