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b03418fc6be38e73746a9a0d95773286d20928a9

If remain-on-exit is set, both the error callback and a SIGCHLD could destroy the same pane (because the first one doesn't remove it from the list of panes), causing the pane bufferevent to be freed twice. So don't free it if the fd has already been set to -1, from Romain Francoise.
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