sshpeer: check pipe validity before forwarding output from it...
sshpeer: check pipe validity before forwarding output from it
After the previous fix, fileobjectproxy._observedcall() (called when
win32.peekpipe() accesses .fileno) started exploding. With this fix, similar
checks are needed inside debugwireproto(). Since that is hardcoded to not use
os.devnull, IDK if those are worth fixing.
