fs/efivarfs/super.c: use static const for dentry_operations

...like other filesystems.

Signed-off-by: Fabian Frederick <fabf@skynet.be>
Cc: Matthew Garrett <matthew.garrett@nebula.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/efivarfs/super.c b/fs/efivarfs/super.c
index becc725..0a48886 100644
--- a/fs/efivarfs/super.c
+++ b/fs/efivarfs/super.c
@@ -83,7 +83,7 @@
 	return 0;
 }
 
-static struct dentry_operations efivarfs_d_ops = {
+static const struct dentry_operations efivarfs_d_ops = {
 	.d_compare = efivarfs_d_compare,
 	.d_hash = efivarfs_d_hash,
 	.d_delete = always_delete_dentry,