constify dentry_operations: misc filesystems

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/hpfs/dentry.c b/fs/hpfs/dentry.c
index 0831912..940d6d1 100644
--- a/fs/hpfs/dentry.c
+++ b/fs/hpfs/dentry.c
@@ -49,7 +49,7 @@
 	return 0;
 }
 
-static struct dentry_operations hpfs_dentry_operations = {
+static const struct dentry_operations hpfs_dentry_operations = {
 	.d_hash		= hpfs_hash_dentry,
 	.d_compare	= hpfs_compare_dentry,
 };