constify dentry_operations: autofs, autofs4

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/autofs4/inode.c b/fs/autofs4/inode.c
index 716e12b..69c8142 100644
--- a/fs/autofs4/inode.c
+++ b/fs/autofs4/inode.c
@@ -310,7 +310,7 @@
 	return ino;
 }
 
-static struct dentry_operations autofs4_sb_dentry_operations = {
+static const struct dentry_operations autofs4_sb_dentry_operations = {
 	.d_release      = autofs4_dentry_release,
 };