diskwu
03f46c6694
避免警告，变量可能未初始化就使用 (#5544)
* 避免警告，变量可能未初始化就使用
* 避免警告，变量可能未初始化就使用
* 避免警告，变化可能未初始化就使用。
* Update bsp/stm32/libraries/HAL_Drivers/drv_usart.c
Co-authored-by: guo <guozhanxin@rt-thread.com>
* Update bsp/stm32/libraries/HAL_Drivers/drv_usart_v2.c
Co-authored-by: guo <guozhanxin@rt-thread.com>
Co-authored-by: guo <guozhanxin@rt-thread.com>
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