How to fix a patch already sent ???

[Jorge Ventura]

I sent a patch recently that is working properly but later I detected
a warning from the Perl interpreter.

How should I proceed?
1) Send a single [PATCH 1/1] completely fixed ?
2) Send dual [PATCH 1/2 and 2/2] with the previous patch plus the fix
to the previous patch?

What is the correct procedure for a situation like this?

Sincerely,
Ventura