const: struct quota_format_ops

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
diff --git a/fs/quota/quota_v2.c b/fs/quota/quota_v2.c
index a5475fb..01f25ea 100644
--- a/fs/quota/quota_v2.c
+++ b/fs/quota/quota_v2.c
@@ -207,7 +207,7 @@
 	return 0;
 }
 
-static struct quota_format_ops v2_format_ops = {
+static const struct quota_format_ops v2_format_ops = {
 	.check_quota_file	= v2_check_quota_file,
 	.read_file_info		= v2_read_file_info,
 	.write_file_info	= v2_write_file_info,