debugging v -live message.v

tools/vbuild-examples.v

@@ -17,7 +17,8 @@ fn main() {
 	vexe := args[1]
 	ret := os.system('$vexe -live examples/hot_reload/message.v')
 	if ret != 0 {
-		println('-live message.v failed')
+		println('v -live message.v failed')
 		exit(1)
 	}
+	println('v -live message.v is ok')
 }

vlib/builtin/builtin.v

@@ -130,7 +130,7 @@ TODO
 #endif
 */
 	ptr := C.malloc(n)
-	if isnil(ptr) {
+	if ptr == 0 {
 		panic('malloc($n) failed')
 	}
 	return ptr