Fix a badmatch issue when calling which_children on SPDY process
Fix a badmatch issue when calling which_children on SPDY process

noname007/cowboy,callsign-core/cowboy_hybi00,layerhq/cowboy,ferd/cowboyku,essen/cowboy,paulperegud/cowboy,binarin/cowboy,grahamrhay/cowboy,rabbitmq/cowboy,heroku/cowboyku,K2InformaticsGmbH/cowboy,unisontech/cowboy,omusico/cowboy,acrispin/cowboy,ninenines/cowboy,dangjun625/cowboy,cad627/cowboy,linearregression/cowboyku,essen/cowboy,layerhq/cowboy,sile/cowboy,lpgauth/cowboy,CrankWheel/cowboy,276361270/cowboy,manastech/cowboy,odo/cowboy,venkateshreddy/cowboy,unisontech/cowboy,nviennot/cowboy,hairyhum/cowboy,MSch/cowboy,callsign-core/cowboy_hybi00,pap/cowboy,bsmr-erlang/cowboy,yangchengjian/cowboy,cad627/cowboy,bobos/ecweb,manastech/cowboy,binarin/cowboy,imdeps/cowboy,kivra/cowboy,turtleDeng/cowboy,yangchengjian/cowboy,lpgauth/cowboy,Reimerei/cowboy