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vc: eleminate strcpy in multab code

--- a/sys/src/cmd/vc/mul.c

+++ b/sys/src/cmd/vc/mul.c

@@ -116,8 +116,7 @@

 	if(g) {

 		m1 = mulcon0(v);

 		if(m1) {

-			strcpy(m->code, m1->code);

-			sprint(strchr(m->code, 0), "%c0", g+'a');

+			snprint(m->code, sizeof m->code, "%s%c0", m1->code, g+'a');

 			return m;

 		}

 	}