i40e/base: force a shifted bit to be unsigned
i40e/base: force a shifted bit to be unsigned

Force a shifted '1' to be 'unsigned' to avoid shifting a signed int.

Signed-off-by: Helin Zhang <aba9dfdb1a6ec8bf1ff66b95272c029f8dfde1b1@intel.com>
Reviewed-by: Chen Jing <2b730c2e01419ef3cbe586e212d13b674b74d017@intel.com>
Tested-by: HuilongX Xu <66b391ba07b4e1e575c4888dad46879fa332fb22@intel.com>

venkynv/dpdk-mirror,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,msune/dpdk,john-mcnamara-intel/dpdk,mixja/dpdk,venkynv/dpdk-mirror,venkynv/dpdk-mirror,mixja/dpdk,tsphillips/dpdk-fork,mixja/dpdk,msune/dpdk,mixja/dpdk,john-mcnamara-intel/dpdk,msune/dpdk,venkynv/dpdk-mirror,tsphillips/dpdk-fork,tsphillips/dpdk-fork,tsphillips/dpdk-fork,msune/dpdk