constify dentry_operations: procfs

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/proc/generic.c b/fs/proc/generic.c
index db7fa5c..5d2989e 100644
--- a/fs/proc/generic.c
+++ b/fs/proc/generic.c
@@ -363,7 +363,7 @@
 	return 1;
 }
 
-static struct dentry_operations proc_dentry_operations =
+static const struct dentry_operations proc_dentry_operations =
 {
 	.d_delete	= proc_delete_dentry,
 };