do not null top_prot reference on destroy
do not null top_prot reference on destroy

TarantulaTechnology/JGroups,vjuranek/JGroups,rhusar/JGroups,Sanne/JGroups,pruivo/JGroups,ibrahimshbat/JGroups,ibrahimshbat/JGroups,belaban/JGroups,rvansa/JGroups,pruivo/JGroups,ligzy/JGroups,danberindei/JGroups,dimbleby/JGroups,slaskawi/JGroups,slaskawi/JGroups,tristantarrant/JGroups,ibrahimshbat/JGroups,pferraro/JGroups,ligzy/JGroups,ligzy/JGroups,Sanne/JGroups,vjuranek/JGroups,vjuranek/JGroups,dimbleby/JGroups,danberindei/JGroups,danberindei/JGroups,Sanne/JGroups,deepnarsay/JGroups,rpelisse/JGroups,rhusar/JGroups,belaban/JGroups,dimbleby/JGroups,rhusar/JGroups,ibrahimshbat/JGroups,rpelisse/JGroups,kedzie/JGroups,pruivo/JGroups,kedzie/JGroups,deepnarsay/JGroups,pferraro/JGroups,rvansa/JGroups,TarantulaTechnology/JGroups,slaskawi/JGroups,rpelisse/JGroups,TarantulaTechnology/JGroups,belaban/JGroups,pferraro/JGroups,deepnarsay/JGroups,kedzie/JGroups,tristantarrant/JGroups