Zero the correct amount of memory when expanding hashes
Zero the correct amount of memory when expanding hashes

This fixes linear hash iteration. Strange that this hasn't been noticed
before.

tkob/parrot,FROGGS/parrot,gagern/parrot,FROGGS/parrot,tewk/parrot-select,tkob/parrot,FROGGS/parrot,tkob/parrot,gagern/parrot,tewk/parrot-select,FROGGS/parrot,tewk/parrot-select,youprofit/parrot,parrot/parrot,parrot/parrot,gitster/parrot,tkob/parrot,gitster/parrot,gitster/parrot,parrot/parrot,tewk/parrot-select,tewk/parrot-select,youprofit/parrot,youprofit/parrot,gagern/parrot,parrot/parrot,youprofit/parrot,FROGGS/parrot,gagern/parrot,FROGGS/parrot,youprofit/parrot,tkob/parrot,tkob/parrot,gagern/parrot,youprofit/parrot,tkob/parrot,tewk/parrot-select,parrot/parrot,FROGGS/parrot,gitster/parrot,tkob/parrot,gitster/parrot,youprofit/parrot,gagern/parrot,gagern/parrot,FROGGS/parrot,youprofit/parrot,tewk/parrot-select,gitster/parrot,gitster/parrot