frida.get_usb_device() can not works at first time.

使用 Python 3.9 和 Frida 14.0.0 重现首次调用失败，然后根据 traceback 检查 frida/init.py 中的 get_usb_device 和 get_device_matching 方法，以及 frida/core.py:get_device_matching。完成的标准是，初始调用 frida.get_usb_device() 无需重试或 sleep 即可找到 USB 设备。

Please check the error logs as follow: (frida --version 14.0.0)

Python 3.9.0 (tags/v3.9.0:9cf6752, Oct  5 2020, 15:34:40) [MSC v.1927 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import frida
>>> frida.get_usb_device()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Users\Bytedance\AppData\Local\Programs\Python\Python39\lib\site-packages\frida\__init__.py", line 82, in get_usb_device
    return get_device_matching(lambda d: d.type == 'usb', timeout, **kwargs)
  File "C:\Users\Bytedance\AppData\Local\Programs\Python\Python39\lib\site-packages\frida\__init__.py", line 90, in get_device_matching
    return get_device_manager().get_device_matching(predicate, timeout, **kwargs)
  File "C:\Users\Bytedance\AppData\Local\Programs\Python\Python39\lib\site-packages\frida\core.py", line 26, in wrapper
    return f(*args, **kwargs)
  File "C:\Users\Bytedance\AppData\Local\Programs\Python\Python39\lib\site-packages\frida\core.py", line 58, in get_device_matching
    return Device(self._impl.get_device_matching(lambda d: predicate(Device(d)), raw_timeout))
frida.InvalidArgumentError: device not found
>>> frida.get_usb_device()
Device(id="89EX0A89A", name="Pixel 3", type='usb')

As you saw it, went I call frida.get_usb_device() first time it will get an error. But if you try to call it second time, it's OK!
So I try to solve this problem as follow and it works:

try:
	device = frida.get_usb_device()
except BaseException: 
	time.sleep(3)
	device = frida.get_usb_device()