git: openjdk/jdk: 8265607: Avoid decrementing when no Symbol was created in ~SignatureStream

[Claes Redestad]

Changeset: a93d9119
Author:    Claes Redestad <redestad at openjdk.org>
Date:      2021-04-22 09:52:56 +0000
URL:       https://git.openjdk.java.net/jdk/commit/a93d9119

8265607: Avoid decrementing when no Symbol was created in ~SignatureStream

Reviewed-by: lfoltan, coleenp

! src/hotspot/share/runtime/signature.cpp