fix Parrot_sprintf_format: use char length, not byte legth, in the format string
fix Parrot_sprintf_format: use char length, not byte legth, in the format string

FROGGS/parrot,tkob/parrot,parrot/parrot,youprofit/parrot,youprofit/parrot,tkob/parrot,FROGGS/parrot,gitster/parrot,parrot/parrot,FROGGS/parrot,FROGGS/parrot,FROGGS/parrot,youprofit/parrot,tkob/parrot,FROGGS/parrot,tkob/parrot,gitster/parrot,gagern/parrot,gagern/parrot,tkob/parrot,FROGGS/parrot,youprofit/parrot,gagern/parrot,gitster/parrot,parrot/parrot,gitster/parrot,gagern/parrot,gagern/parrot,parrot/parrot,gagern/parrot,parrot/parrot,tkob/parrot,tkob/parrot,tkob/parrot,gitster/parrot,youprofit/parrot,youprofit/parrot,gitster/parrot,youprofit/parrot,FROGGS/parrot,gitster/parrot,youprofit/parrot,gagern/parrot