duo: cppcheck failed

[unicornx]

[cpp_check.py 46 INFO] bsp/cvitek/drivers/drv_rtc.c:109:66: error: Signed integer overflow for expression '1<<31'. [integerOverflow]
    value = mmio_read_32(rtc_base + CVI_RTC_SEC_PULSE_GEN) & ~(1 << 31);
                                                                 ^
bsp/cvitek/drivers/drv_rtc.c:112:62: error: Signed integer overflow for expression '1<<31'. [integerOverflow]
    value = mmio_read_32(rtc_base + CVI_RTC_ANA_CALIB) & ~(1 << 31);
                                                             ^
[cpp_check.py 46 INFO] bsp/cvitek/drivers/drv_spi.c:89:12: warning: Identical condition and return expression 'ret', return value is always 0 [identicalConditionAfterEarlyExit]
    return ret;
           ^
bsp/cvitek/drivers/drv_spi.c:74:9: note: If condition 'ret' is true, the function will return/exit
    if (ret)
        ^
bsp/cvitek/drivers/drv_spi.c:89:12: note: Returning identical expression 'ret'
    return ret;
           ^