wl12xx: Fix incorrect warning message.

A warning message in wl12xx_acx_event_mbox_mask has a copy/paste
error. Fix it to print the correct acx command.
Signed-off-by: Ari Kauppi <Ext-Ari.Kauppi@nokia.com>
Signed-off-by: Luciano Coelho <luciano.coelho@nokia.com>
Signed-off-by: Kalle Valo <kalle.valo@nokia.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/wl12xx/acx.c

@@ -735,7 +735,7 @@ int wl12xx_acx_event_mbox_mask(struct wl12xx *wl, u32 event_mask)
 	ret = wl12xx_cmd_configure(wl, ACX_EVENT_MBOX_MASK,
 				   mask, sizeof(*mask));
 	if (ret < 0) {
-		wl12xx_warning("failed to set aid: %d", ret);
+		wl12xx_warning("failed to set acx_event_mbox_mask: %d", ret);
 		goto out;
 	}