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mothra/libpanel: fix memory leak in pledit

--- a/sys/src/cmd/mothra/libpanel/edit.c

+++ b/sys/src/cmd/mothra/libpanel/edit.c

@@ -209,6 +209,12 @@

 void pl_childspaceedit(Panel *g, Point *ul, Point *size){

 	USED(g, ul, size);

 }

+void pl_freeedit(Panel *p){

+	Edit *ep;

+	ep=p->data;

+	if(ep->t!=nil) twfree(ep->t);

+	ep->t=0;

+}

 void plinitedit(Panel *v, int flags, Point minsize, Rune *text, int ntext, void (*hit)(Panel *)){

 	Edit *ep;

 	ep=v->data;

@@ -219,6 +225,7 @@

 	v->type=pl_typeedit;

 	v->getsize=pl_getsizeedit;

 	v->childspace=pl_childspaceedit;

+	v->free=pl_freeedit;

 	v->kind="edit";

 	ep->hit=hit;

 	ep->minsize=minsize;