Fix missing case in coVarsOfTcCo
Fix missing case in coVarsOfTcCo

Reported by Ganesh, Trac #7178.  Fix is easy.

vTurbine/ghc,da-x/ghc,mettekou/ghc,ml9951/ghc,GaloisInc/halvm-ghc,ezyang/ghc,tjakway/ghcjvm,christiaanb/ghc,ml9951/ghc,nkaretnikov/ghc,sgillespie/ghc,forked-upstream-packages-for-ghcjs/ghc,tjakway/ghcjvm,nathyong/microghc-ghc,sdiehl/ghc,mcschroeder/ghc,siddhanathan/ghc,mcschroeder/ghc,christiaanb/ghc,spacekitteh/smcghc,fmthoma/ghc,wxwxwwxxx/ghc,vikraman/ghc,urbanslug/ghc,nushio3/ghc,tjakway/ghcjvm,fmthoma/ghc,gcampax/ghc,anton-dessiatov/ghc,wxwxwwxxx/ghc,tibbe/ghc,da-x/ghc,gridaphobe/ghc,nkaretnikov/ghc,jstolarek/ghc,shlevy/ghc,mfine/ghc,mfine/ghc,ghc-android/ghc,oldmanmike/ghc,shlevy/ghc,christiaanb/ghc,vikraman/ghc,lukexi/ghc,TomMD/ghc,bitemyapp/ghc,GaloisInc/halvm-ghc,AlexanderPankiv/ghc,mettekou/ghc,da-x/ghc,lukexi/ghc-7.8-arm64,siddhanathan/ghc,mfine/ghc,ryantm/ghc,christiaanb/ghc,ekmett/ghc,snoyberg/ghc,GaloisInc/halvm-ghc,nushio3/ghc,hferreiro/replay,olsner/ghc,acowley/ghc,elieux/ghc,holzensp/ghc,wxwxwwxxx/ghc,ghc-android/ghc,nomeata/ghc,elieux/ghc,lukexi/ghc-7.8-arm64,forked-upstream-packages-for-ghcjs/ghc,lukexi/ghc-7.8-arm64,holzensp/ghc,mettekou/ghc,spacekitteh/smcghc,acowley/ghc,vTurbine/ghc,gcampax/ghc,green-haskell/ghc,spacekitteh/smcghc,siddhanathan/ghc,vTurbine/ghc,vikraman/ghc,frantisekfarka/ghc-dsi,tibbe/ghc,wxwxwwxxx/ghc,green-haskell/ghc,ekmett/ghc,ryantm/ghc,nkaretnikov/ghc,mfine/ghc,AlexanderPankiv/ghc,AlexanderPankiv/ghc,AlexanderPankiv/ghc,ml9951/ghc,sdiehl/ghc,hferreiro/replay,green-haskell/ghc,bitemyapp/ghc,olsner/ghc,oldmanmike/ghc,gcampax/ghc,anton-dessiatov/ghc,mcschroeder/ghc,christiaanb/ghc,acowley/ghc,gcampax/ghc,ml9951/ghc,TomMD/ghc,mfine/ghc,snoyberg/ghc,siddhanathan/ghc,urbanslug/ghc,tibbe/ghc,GaloisInc/halvm-ghc,siddhanathan/ghc,lukexi/ghc,hferreiro/replay,ghc-android/ghc,ezyang/ghc,urbanslug/ghc,sdiehl/ghc,ezyang/ghc,frantisekfarka/ghc-dsi,hferreiro/replay,mfine/ghc,hferreiro/replay,green-haskell/ghc,shlevy/ghc,nathyong/microghc-ghc,christiaanb/ghc,snoyberg/ghc,fmthoma/ghc,holzensp/ghc,frantisekfarka/ghc-dsi,sdiehl/ghc,gridaphobe/ghc,jstolarek/ghc,elieux/ghc,tibbe/ghc,vikraman/ghc,nomeata/ghc,vikraman/ghc,oldmanmike/ghc,sgillespie/ghc,gridaphobe/ghc,fmthoma/ghc,fmthoma/ghc,jstolarek/ghc,frantisekfarka/ghc-dsi,oldmanmike/ghc,GaloisInc/halvm-ghc,mcschroeder/ghc,shlevy/ghc,holzensp/ghc,mettekou/ghc,fmthoma/ghc,olsner/ghc,sdiehl/ghc,ezyang/ghc,nushio3/ghc,GaloisInc/halvm-ghc,ml9951/ghc,shlevy/ghc,acowley/ghc,acowley/ghc,olsner/ghc,nomeata/ghc,ekmett/ghc,gcampax/ghc,forked-upstream-packages-for-ghcjs/ghc,TomMD/ghc,lukexi/ghc,jstolarek/ghc,nushio3/ghc,forked-upstream-packages-for-ghcjs/ghc,gridaphobe/ghc,da-x/ghc,elieux/ghc,da-x/ghc,bitemyapp/ghc,urbanslug/ghc,vTurbine/ghc,lukexi/ghc,nathyong/microghc-ghc,ryantm/ghc,olsner/ghc,sgillespie/ghc,snoyberg/ghc,tjakway/ghcjvm,mettekou/ghc,holzensp/ghc,gcampax/ghc,snoyberg/ghc,ghc-android/ghc,vTurbine/ghc,urbanslug/ghc,hferreiro/replay,sdiehl/ghc,oldmanmike/ghc,oldmanmike/ghc,elieux/ghc,siddhanathan/ghc,lukexi/ghc-7.8-arm64,christiaanb/ghc,mettekou/ghc,ryantm/ghc,nomeata/ghc,nomeata/ghc,ghc-android/ghc,nushio3/ghc,TomMD/ghc,sgillespie/ghc,nathyong/microghc-ghc,olsner/ghc,mcschroeder/ghc,sdiehl/ghc,shlevy/ghc,nushio3/ghc,forked-upstream-packages-for-ghcjs/ghc,oldmanmike/ghc,snoyberg/ghc,wxwxwwxxx/ghc,mfine/ghc,da-x/ghc,AlexanderPankiv/ghc,snoyberg/ghc,vikraman/ghc,AlexanderPankiv/ghc,ezyang/ghc,forked-upstream-packages-for-ghcjs/ghc,nushio3/ghc,nathyong/microghc-ghc,urbanslug/ghc,ezyang/ghc,jstolarek/ghc,sgillespie/ghc,frantisekfarka/ghc-dsi,fmthoma/ghc,vikraman/ghc,gridaphobe/ghc,bitemyapp/ghc,ml9951/ghc,sgillespie/ghc,forked-upstream-packages-for-ghcjs/ghc,lukexi/ghc,siddhanathan/ghc,ml9951/ghc,ezyang/ghc,ghc-android/ghc,TomMD/ghc,wxwxwwxxx/ghc,mcschroeder/ghc,nkaretnikov/ghc,ekmett/ghc,spacekitteh/smcghc,tjakway/ghcjvm,hferreiro/replay,sgillespie/ghc,bitemyapp/ghc,AlexanderPankiv/ghc,TomMD/ghc,ghc-android/ghc,gcampax/ghc,shlevy/ghc,ekmett/ghc,nkaretnikov/ghc,wxwxwwxxx/ghc,gridaphobe/ghc,acowley/ghc,da-x/ghc,elieux/ghc,gridaphobe/ghc,acowley/ghc,mettekou/ghc,ryantm/ghc,anton-dessiatov/ghc,nkaretnikov/ghc,nkaretnikov/ghc,anton-dessiatov/ghc,tibbe/ghc,elieux/ghc,GaloisInc/halvm-ghc,olsner/ghc,lukexi/ghc-7.8-arm64,vTurbine/ghc,anton-dessiatov/ghc,TomMD/ghc,nathyong/microghc-ghc,spacekitteh/smcghc,anton-dessiatov/ghc,nathyong/microghc-ghc,vTurbine/ghc,mcschroeder/ghc,ml9951/ghc,tjakway/ghcjvm,urbanslug/ghc,green-haskell/ghc,anton-dessiatov/ghc,tjakway/ghcjvm