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ren: flush the partial line before computing .sp absolute positions

Reported by Dirk-Wilhelm Peters <[email protected]>.

--- a/ren.c

+++ b/ren.c

@@ -418,9 +418,10 @@

 void tr_sp(char **args)

 {

 	int traps = 0;

-	int n = args[1] ? eval(args[1], 'v') : n_v;

+	int n;

 	if (args[0][0] == c_cc)

 		traps = ren_br();

+	n = args[1] ? eval(args[1], 'v') : n_v;

 	if (n && (!n_ns || ren_div) && !traps)

 		down(n);

 }