constify dentry_operations: rest

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/net/socket.c b/net/socket.c
index 35dd737..2f895f6 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -328,7 +328,7 @@
 				dentry->d_inode->i_ino);
 }
 
-static struct dentry_operations sockfs_dentry_operations = {
+static const struct dentry_operations sockfs_dentry_operations = {
 	.d_delete = sockfs_delete_dentry,
 	.d_dname  = sockfs_dname,
 };