Meaningless to judge the link state according to the memset'ed
link variable, this patch fixes this logical issue.
In addition, this patch changes the variable from link_check to link_up
according to its real meaning.
Fixes: 80ba61115e77 ("net/e1000: use link status helper functions")
Cc: stable@dpdk.org
Signed-off-by: Lunyuan Cui <lunyuanx.cui@intel.com>
Acked-by: Xiaolong Ye <xiaolong.ye@intel.com>
Acked-by: Wenzhuo Lu <wenzhuo.lu@intel.com>