[stm32][drv_serial] 修复recv_len意外为负(即很大正数)的问题
https://github.com/RT-Thread/rt-thread/issues/6106 https://github.com/RT-Thread/rt-thread/issues/4467#issuecomment-850814143
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https://github.com/RT-Thread/rt-thread/issues/6106 https://github.com/RT-Thread/rt-thread/issues/4467#issuecomment-850814143