[][kernel][common][eth][Fix panic issue for mtk_pending_work]

[Description]
Fix panic issue for mtk_pending_work.

If without this patch, mtk_pending_work might cause kernel panic
in the one gmac system.

[Release-log]
N/A


Change-Id: I9d2940645d738bac8888a7410c5ad5586a08c115
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/6814894
1 file changed