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mothra: fix nil pointer crash

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

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

@@ -137,12 +137,14 @@

 	Rtext *t;

 	int yoffs;

 	extern Panel *pl_kbfocus;	/* this is a secret panel library name */

-	yoffs=text->r.min.y-plgetpostextview(text);

-	for(t=current->text;t;t=t->next) if(!eqrect(t->r, Rect(0,0,0,0))){

-		if(t->r.max.y+yoffs>text->r.max.y) break;

-		if(t->r.min.y+yoffs>=text->r.min.y

-		&& t->b==0

-		&& subpanel(t->p, pl_kbfocus)) return;

+	if(current){

+		yoffs=text->r.min.y-plgetpostextview(text);

+		for(t=current->text;t;t=t->next) if(!eqrect(t->r, Rect(0,0,0,0))){

+			if(t->r.max.y+yoffs>text->r.max.y) break;

+			if(t->r.min.y+yoffs>=text->r.min.y

+			&& t->b==0

+			&& subpanel(t->p, pl_kbfocus)) return;

+		}

 	}

 	plgrabkb(cmd);

 }

-- 

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