Merge "Check return value in screencap in case of failure."

    result = outBuffer->lock(GraphicBuffer::USAGE_SW_READ_OFTEN, &base);

    if (base == NULL) {

    if (base == nullptr || result != NO_ERROR) {

        String8 reason;

        if (base == nullptr) {

            reason = "Failed to write to buffer";

        } else {

            reason.appendFormat("Error Code: %d", result);

        }

        fprintf(stderr, "Failed to take screenshot (%s)\n", reason.c_str());

        close(fd);

        return 1;

    }