Commit 300af65555 introdued a problem in
conditional statement, script will always abort in silent mode, it doesn't
care about the return value.
Fixes #3485
Signed-off-by: Amos Kong <amos@scylladb.com>
Message-Id: <1c12ab04651352964a176368f8ee28f19ae43c68.1528077114.git.amos@scylladb.com>