cw1200: fix spelling mistake: "Mailformed" -> "Malformed"

Trivial fix to spelling mistake in wiphy_warn warning message text
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Signed-off-by: NKalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/st/cw1200/txrx.c

@@ -1069,7 +1069,7 @@ void cw1200_rx_cb(struct cw1200_common *priv,
 	}
 
 	if (skb->len < sizeof(struct ieee80211_pspoll)) {
-		wiphy_warn(priv->hw->wiphy, "Mailformed SDU rx'ed. Size is lesser than IEEE header.\n");
+		wiphy_warn(priv->hw->wiphy, "Malformed SDU rx'ed. Size is lesser than IEEE header.\n");
 		goto drop;
 	}