router_route_intern: squash GCC warning on Solaris 10
router_route_intern: squash GCC warning on Solaris 10

router.c:1084:6: warning: this decimal constant is unsigned only in ISO
C90 [enabled by default]

zzl0/carbon-c-relay,Skyscanner/carbon-c-relay,tjamesturner/carbon-c-relay,grobian/carbon-c-relay,piotr1212/carbon-c-relay,piotr1212/carbon-c-relay,grobian/carbon-c-relay,zzl0/carbon-c-relay,grobian/carbon-c-relay,lyft/carbon-c-relay,tjamesturner/carbon-c-relay,rtoma/carbon-c-relay,lyft/carbon-c-relay,piotr1212/carbon-c-relay,piotr1212/carbon-c-relay,lyft/carbon-c-relay,Skyscanner/carbon-c-relay,rtoma/carbon-c-relay