store: fix length check in uniqueNameURLs
store: fix length check in uniqueNameURLs

I mentioned this in the review, but I think it must
have been obscured by another suggestion I made
in the same comment.

R=fwereade, niemeyer
CC=
https://codereview.appspot.com/5720051

reedobrien/juju,howbazaar/juju,anastasiamac/juju,cmars/juju,frankban/juju,sinzui/juju,bz2/juju,sinzui/juju,ericsnowcurrently/juju,tsakas/juju,rogpeppe/juju,mattyw/juju,jrwren/juju,reedobrien/juju,reedobrien/juju,davecheney/juju,ericsnowcurrently/juju,macgreagoir/juju,tych0/juju,axw/juju,howbazaar/juju,AdamIsrael/juju,AdamIsrael/juju,kat-co/juju,cloud-green/juju,fwereade/juju,dooferlad/juju,cherylj/juju,cherylj/juju,mhilton/juju-juju,mhilton/juju,bz2/juju,bogdanteleaga/juju,bogdanteleaga/juju,axw/juju,mikemccracken/juju,dimitern/juju,anastasiamac/juju,davecheney/juju,makyo/juju,perrito666/juju,thomnico/juju,tsakas/juju,bac/juju,mikemccracken/juju,Altoros/juju-vmware,bogdanteleaga/juju,wwitzel3/juju,alesstimec/juju,tasdomas/juju,gabriel-samfira/juju,Altoros/juju-cloudsigma,mikemccracken/juju,kat-co/juju,mhilton/juju-juju,perrito666/juju,anastasiamac/juju,bac/juju,reedobrien/juju,waigani/juju,waigani/juju,kat-co/juju,bz2/juju,ericsnowcurrently/juju,mhilton/juju-juju,dimitern/juju,mjs/juju,mikemccracken/juju,marcoceppi/juju,frankban/juju-tmp,mattyw/juju,frankban/juju,tych0/juju,ericsnowcurrently/juju,cloud-green/juju,alesstimec/juju,waigani/juju,macgreagoir/juju,cloud-green/juju,frankban/juju,voidspace/juju,dooferlad/juju,gabriel-samfira/juju,alesstimec/juju,mhilton/juju,fwereade/juju,cmars/juju,sinzui/juju,davecheney/juju,fwereade/juju,perrito666/juju,mjs/juju,dooferlad/juju,mhilton/juju-juju,fwereade/juju,thomnico/juju,axw/juju,axw/juju,gabriel-samfira/juju,bac/juju,gabriel-samfira/juju,frobware/juju,voidspace/juju,reedobrien/store,makyo/juju,waigani/juju,wwitzel3/juju,bz2/juju,frankban/juju,Altoros/juju-cloudsigma,rogpeppe/juju,macgreagoir/juju,axw/juju,howbazaar/juju,marcoceppi/juju,Altoros/juju-cloudsigma,Altoros/juju-cloudsigma,cherylj/juju,Altoros/juju-vmware,howbazaar/juju,marcmolla/juju,jrwren/juju,mikemccracken/juju,frobware/juju,Altoros/juju-vmware,alesstimec/juju,davecheney/juju,tasdomas/juju,mattyw/juju,cmars/juju,kat-co/juju,mattyw/juju,voidspace/juju,sinzui/juju,cherylj/juju,frankban/juju-tmp,tasdomas/juju,alesstimec/juju,voidspace/juju,mjs/juju,macgreagoir/juju,makyo/juju,thomnico/juju,marcoceppi/juju,cloud-green/juju,dooferlad/juju,tasdomas/juju,reedobrien/juju,marcmolla/juju,anastasiamac/juju,marcmolla/juju,rogpeppe/juju,makyo/juju,AdamIsrael/juju,frankban/juju-tmp,dimitern/juju,dooferlad/juju,mhilton/juju,thomnico/juju,wwitzel3/juju,macgreagoir/juju,mjs/juju,mjs/juju,howbazaar/juju,AdamIsrael/juju,mhilton/juju,frankban/juju,bac/juju,mjs/juju,bac/juju,tsakas/juju,tsakas/juju,tych0/juju,marcmolla/juju,bogdanteleaga/juju,anastasiamac/juju,marcoceppi/juju,tych0/juju,mjs/juju,frankban/juju-tmp,jrwren/juju,Altoros/juju-vmware,cmars/juju,perrito666/juju,gabriel-samfira/juju,marcmolla/juju,kat-co/juju,perrito666/juju,wwitzel3/juju,dimitern/juju,dimitern/juju,frobware/juju,bz2/juju,ericsnowcurrently/juju