Fix an edge error in getting the carp interfaces reported by Effone.
Fix an edge error in getting the carp interfaces reported by Effone.

pfsense/pfsense,BlackstarGroup/pfsense,NewEraCracker/pfsense,ch1c4um/pfsense,ch1c4um/pfsense,NewEraCracker/pfsense,NOYB/pfsense,brunostein/pfsense,brunostein/pfsense,NewEraCracker/pfsense,brunostein/pfsense,phil-davis/pfsense,NOYB/pfsense,ptorsten/pfsense,ch1c4um/pfsense,phil-davis/pfsense,ch1c4um/pfsense,dennypage/pfsense,BlackstarGroup/pfsense,dennypage/pfsense,BlackstarGroup/pfsense,pfsense/pfsense,dennypage/pfsense,jxmx/pfsense,jxmx/pfsense,ptorsten/pfsense,ptorsten/pfsense,NewEraCracker/pfsense,phil-davis/pfsense,BlackstarGroup/pfsense,dennypage/pfsense,pfsense/pfsense,pfsense/pfsense,jxmx/pfsense,NOYB/pfsense,phil-davis/pfsense