array: fix memory bug with mutable array args

compiler/gen_c.v

@@ -461,7 +461,11 @@ fn (p mut Parser) gen_array_push(ph int, typ, expr_type, tmp, tmp_typ string) {
 		// Don't dereference if it's already a mutable array argument  (`fn foo(mut []int)`)
 		push_call := if typ.contains('*'){'_PUSH('} else { '_PUSH(&'}
 		p.cgen.set_placeholder(ph, push_call)
+		if tmp_typ.ends_with('*') {
+			p.gen('), $tmp, ${tmp_typ.left(tmp_typ.len - 1)})')
+		} else {
 			p.gen('), $tmp, $tmp_typ)')
 		}
 	}
+}