constify dentry_operations: 9p

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/9p/vfs_dentry.c b/fs/9p/vfs_dentry.c
index 06dcc7c..d743252 100644
--- a/fs/9p/vfs_dentry.c
+++ b/fs/9p/vfs_dentry.c
@@ -104,12 +104,12 @@
 	}
 }
 
-struct dentry_operations v9fs_cached_dentry_operations = {
+const struct dentry_operations v9fs_cached_dentry_operations = {
 	.d_delete = v9fs_cached_dentry_delete,
 	.d_release = v9fs_dentry_release,
 };
 
-struct dentry_operations v9fs_dentry_operations = {
+const struct dentry_operations v9fs_dentry_operations = {
 	.d_delete = v9fs_dentry_delete,
 	.d_release = v9fs_dentry_release,
 };