bridge: Don't pass messages on a closed pipe in CockpitPipeChannel
bridge: Don't pass messages on a closed pipe in CockpitPipeChannel

Closes #2643
Reviewed-by: Marius Vollmer <bb11c6e942c5cc765df5f04da146b3198127a7a3@redhat.com>

arilivigni/cockpit,zigitax/cockpit,andreasn/cockpit,mvollmer/cockpit,FireDrunk/cockpit,larskarlitski/cockpit,petervo/cockpit,jscotka/cockpit,moraleslazaro/cockpit,sgallagher/cockpit,harishanand95/cockpit,larsu/cockpit,SotolitoLabs/cockpit,harishanand95/cockpit,michalskrivanek/cockpit,SotolitoLabs/cockpit,dperpeet/cockpit,cockpituous/cockpit,SotolitoLabs/cockpit,moraleslazaro/cockpit,garrett/cockpit,dperpeet/cockpit,haiyangd/cockpit_view,petervo/cockpit,petervo/cockpit,SotolitoLabs/cockpit,SotolitoLabs/cockpit,dperpeet/cockpit,michalskrivanek/cockpit,moraleslazaro/cockpit,harishanand95/cockpit,deryni/cockpit,larsu/cockpit,deryni/cockpit,martinpitt/cockpit,stefwalter/cockpit,arilivigni/cockpit,cockpituous/cockpit,FireDrunk/cockpit,moraleslazaro/cockpit,petervo/cockpit,vanloswang/cockpit,sgallagher/cockpit,arilivigni/cockpit,martinpitt/cockpit,michalskrivanek/cockpit,matobet/cockpit,michalskrivanek/cockpit,larsu/cockpit,SotolitoLabs/cockpit,stefwalter/cockpit,mareklibra/cockpit,cockpit-project/cockpit,harishanand95/cockpit,moolitayer/cockpit,vanloswang/cockpit,denysvitali/cockpit,Scribery/cockpit,dperpeet/cockpit,xhad/cockpit,garrett/cockpit,Scribery/cockpit,garrett/cockpit,matobet/cockpit,martinpitt/cockpit,Scribery/cockpit,SotolitoLabs/cockpit,vanloswang/cockpit,mareklibra/cockpit,zigitax/cockpit,larskarlitski/cockpit,matobet/cockpit,moraleslazaro/cockpit,mareklibra/cockpit,zigitax/cockpit,moolitayer/cockpit,FireDrunk/cockpit,larskarlitski/cockpit,Armstrong1992/cockpit,Armstrong1992/cockpit,zigitax/cockpit,arilivigni/cockpit,sgallagher/cockpit,petervo/cockpit,xhad/cockpit,arilivigni/cockpit,FireDrunk/cockpit,jscotka/cockpit,matobet/cockpit,martinpitt/cockpit,deryni/cockpit,cockpituous/cockpit,deryni/cockpit,michalskrivanek/cockpit,andreasn/cockpit,moolitayer/cockpit,jscotka/cockpit,Armstrong1992/cockpit,vanloswang/cockpit,haiyangd/cockpit_view,andreasn/cockpit,xhad/cockpit,jscotka/cockpit,zigitax/cockpit,andreasn/cockpit,moolitayer/cockpit,moraleslazaro/cockpit,mvollmer/cockpit,Scribery/cockpit,Armstrong1992/cockpit,cockpit-project/cockpit,harishanand95/cockpit,dperpeet/cockpit,cockpituous/cockpit,mareklibra/cockpit,denysvitali/cockpit,garrett/cockpit,andreasn/cockpit,haiyangd/cockpit_view,petervo/cockpit,mareklibra/cockpit,vanloswang/cockpit,harishanand95/cockpit,stefwalter/cockpit,xhad/cockpit,Scribery/cockpit,matobet/cockpit,cockpit-project/cockpit,andreasn/cockpit,FireDrunk/cockpit,larskarlitski/cockpit,Scribery/cockpit,matobet/cockpit,deryni/cockpit,Armstrong1992/cockpit,dperpeet/cockpit,denysvitali/cockpit,arilivigni/cockpit,larsu/cockpit,moolitayer/cockpit,cockpituous/cockpit,denysvitali/cockpit,haiyangd/cockpit_view,larskarlitski/cockpit,mareklibra/cockpit,arilivigni/cockpit,haiyangd/cockpit_view,cockpit-project/cockpit,stefwalter/cockpit,jscotka/cockpit,mvollmer/cockpit,mvollmer/cockpit,cockpituous/cockpit,larskarlitski/cockpit,Scribery/cockpit,xhad/cockpit,sgallagher/cockpit,vanloswang/cockpit,garrett/cockpit,deryni/cockpit,larskarlitski/cockpit,stefwalter/cockpit,xhad/cockpit,xhad/cockpit,dperpeet/cockpit,harishanand95/cockpit,cockpit-project/cockpit,mareklibra/cockpit,vanloswang/cockpit,sgallagher/cockpit,michalskrivanek/cockpit,stefwalter/cockpit,mvollmer/cockpit,michalskrivanek/cockpit,moraleslazaro/cockpit,denysvitali/cockpit,martinpitt/cockpit,andreasn/cockpit,sgallagher/cockpit,jscotka/cockpit,larsu/cockpit,deryni/cockpit,larsu/cockpit,stefwalter/cockpit,sgallagher/cockpit,petervo/cockpit