constify dentry_operations: sysfs

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c
index 82d3b79..6b8fe71 100644
--- a/fs/sysfs/dir.c
+++ b/fs/sysfs/dir.c
@@ -302,7 +302,7 @@
 	iput(inode);
 }
 
-static struct dentry_operations sysfs_dentry_ops = {
+static const struct dentry_operations sysfs_dentry_ops = {
 	.d_iput		= sysfs_d_iput,
 };