goto 格式

• goto label

if (container.size.width <= 0 || container.size.height <= 0) goto fail;

fail:
    if (cgPath) CFRelease(cgPath);
    if (ctSetter) CFRelease(ctSetter);
    if (ctFrame) CFRelease(ctFrame);
    if (lineOrigins) free(lineOrigins);
    if (lineRowsEdge) free(lineRowsEdge);
    if (lineRowsIndex) free(lineRowsIndex);
    return nil;