bms err num use u16

Signed-off-by: FuangCao <cavan.cao@foxmail.com>

Source/app_rs485_1.h

@@ -278,7 +278,7 @@ typedef struct
 {
 	uint32_t bms_err_timeout_cnt;
 	uint16_t bms_err_cnt;
-	uint8_t bms_err_num;
+	uint16_t bms_err_num;
 }BMS_ERROR;
 
 #define TI_VALID_FLAG_KEY   (0x0327)