[][[mt76]initialize wcid in mt7915_mac_tx_free]

[Description]
Add wcid initializetion to fix panic issue

[Release-log]
N/A

Change-Id: I1e3e7d4c8c59d72b17a93a5b0562c5518bdb66e9
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/6237595
1 file changed