rebase: delete unused p1 argument to _concludenode()
Unused since
a0192a03216d (rebase: remove now unnecessary logic to
allow empty commit when branch changes, 2020-07-09).
Differential Revision: https://phab.mercurial-scm.org/D9055
#require serve
$ hg clone http://localhost:$HGPORT/ copy
abort: * (glob)
[255]
$ test -d copy
[1]
$ "$PYTHON" "$TESTDIR/dumbhttp.py" -p $HGPORT --pid dumb.pid
$ cat dumb.pid >> $DAEMON_PIDS
$ hg clone http://localhost:$HGPORT/foo copy2
abort: HTTP Error 404: * (glob)
[255]
$ killdaemons.py