TODO: deprecate use of rmmod -w

As discussed with Rusty Russel, it would be nice to remove the related
code from kernel. Deprecate its use on kmod, so people know they
shouldn't be using it.
diff --git a/TODO b/TODO
index d125122..286eeda 100644
--- a/TODO
+++ b/TODO
@@ -35,6 +35,10 @@
 
 * Implement actions in kmod tool like 'insert', 'remove', 'info', etc
 
+* Deprecate "rmmod -w", friends and KMOD_REMOVE_NOWAIT from libkmod.
+  The blocking delete_module will be removed from the kernel. Deprecate it and
+  print a warning to the user because he shouldn't be using it.
+
 Things to be added/removed in kernel (check what is really needed):
 ===================================================================