git: openjdk/jdk: 8300654: Remove JVMFlag::flag_error_str as it is unused

[Frederic Parain]

Changeset: 8e201452
Author:    Afshin Zafari <Afshin.zafari at oracle.com>
Committer: Frederic Parain <fparain at openjdk.org>
Date:      2023-03-06 12:46:18 +0000
URL:       https://git.openjdk.org/jdk/commit/8e2014527ead67ce33627a49223b8269a94f3102

8300654: Remove JVMFlag::flag_error_str as it is unused

Reviewed-by: dholmes, fparain

! src/hotspot/share/runtime/flags/jvmFlag.cpp
! src/hotspot/share/runtime/flags/jvmFlag.hpp