Syntax error in releaseCheck.sh

[sxa]

There seems to be an issue in the releaseCheck script, at least when run on the C3jenkins node - I couldn't replicate this on my local machine:

From https://ci.adoptium.net/job/build-scripts/job/release/job/refactor_openjdk_release_tool/8046/console

Linux on x64: OK!
Linux on aarch64: Not published:
Linux on ppc64le: OK!
Linux on s390x: OK!
Linux on arm: Not published:
AIX on ppc64: Not published:
../sbin/releaseCheck.sh: 62: [: x64: unexpected operator
../sbin/releaseCheck.sh: 62: [: aarch64: unexpected operator
Windows on x64: OK!
MacOS on x64: OK!
MacOS on aarch64: OK!
Source images: OK!