[test] disallow negative repeat counts
[test] disallow negative repeat counts

in t/codingstd/c_indent.t, observable with perl5.21.7

tkob/parrot,tkob/parrot,youprofit/parrot,tkob/parrot,parrot/parrot,parrot/parrot,tkob/parrot,youprofit/parrot,parrot/parrot,youprofit/parrot,youprofit/parrot,tkob/parrot,parrot/parrot,youprofit/parrot,youprofit/parrot,parrot/parrot,tkob/parrot,tkob/parrot,tkob/parrot,youprofit/parrot,youprofit/parrot