wifi: mac80211_hwsim: fix warning

WARN_ON("string") will unconditionally trigger a warning, but
not really do what it may look like. Use WARN(1, ...) instead
and add the mode number as well.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Link: https://patch.msgid.link/20240705133921.a50aa5b15ece.I9a25b7448b0498c0c2e503986978dae165c8bdf8@changeidSigned-off-by: Johannes Berg <johannes.berg@intel.com>

drivers/net/wireless/virtual/mac80211_hwsim.c

@@ -3261,7 +3261,7 @@ static int mac80211_hwsim_switch_vif_chanctx(struct ieee80211_hw *hw,
 			hwsim_clear_chanctx_magic(vifs[i].old_ctx);
 			break;
 		default:
-			WARN_ON("Invalid mode");
+			WARN(1, "Invalid mode %d\n", mode);
 		}
 	}
 	return 0;