linuxkpi 802.11: Free entire mbuf chain on failure

Reviewed by:	bz
Sponsored by:	The FreeBSD Foundation
Fixes: 0936c648ad ("LinuxKPI: 802.11: update the ni/lsta reference cycle")
Fixes: c816f64e66 ("LinuxKPI: 802.11: plug mbuf leak")
Differential Revision: https://reviews.freebsd.org/D57477

sys/compat/linuxkpi/common/src/linux_80211.c

@@ -5473,7 +5473,7 @@ lkpi_xmit(struct ieee80211_node *ni, struct mbuf *m,
 #endif
 		LKPI_80211_LSTA_TXQ_UNLOCK(lsta);
 		if (freem)
-			m_free(m);
+			m_freem(m);
 		return (ENETDOWN);
 	}
 
@@ -5482,7 +5482,7 @@ lkpi_xmit(struct ieee80211_node *ni, struct mbuf *m,
 	if (error != 0) {
 		LKPI_80211_LSTA_TXQ_UNLOCK(lsta);
 		if (freem)
-			m_free(m);
+			m_freem(m);
 #ifdef LINUXKPI_DEBUG_80211
 		if (linuxkpi_debug_80211 & D80211_TRACE_TX)
 			ic_printf(ni->ni_ic, "%s: mbufq_enqueue failed: %d\n",