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mothra: fix crash

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

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

@@ -186,7 +186,8 @@

 			s=pl_getattr(g->attr, "alt");

 			if(s==0 || *s == 0) s = f->value;

 			pl_htmloutput(g, g->nsp, s, f);

-			g->state->image[0] = 0;

+			free(g->state->image);

+			g->state->image = 0;

 			g->state->width=0;

 			g->state->height=0;

 			break;