Return instead of exit on argument mismatch in os::cmd
Return instead of exit on argument mismatch in os::cmd

We just want to fail the script that is running, as it
incorrectly called an os::cmd function. We do *not* want
to kill the entire shell immediately, as we should honor
anything that the shell wanted to trap on ERR.

Signed-off-by: Steve Kuznetsov <a7da0fca91d9933d2725d731a48cabdc9e8ffd7a@redhat.com>

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