git: openjdk/loom: fibers: Fix previous commit to pop(). Error checking was not correct.

[duke]

Changeset: f6b45f3b
Author:    Chris Plummer <chris.plummer at oracle.com>
Date:      2022-03-19 20:00:51 +0000
URL:       https://git.openjdk.java.net/loom/commit/f6b45f3b423eb3205fbe3ddc44a91e4b25295012

Fix previous commit to pop(). Error checking was not correct.

! src/jdk.jdi/share/classes/com/sun/tools/jdi/StackFrameImpl.java