iwlwifi: yoyo: don't print failure if debug firmware is missing

Missing this firmware is not fatal, my wifi card still works. Even more,
I couldn't find any documentation what it is or where to get it. So, I
don't think the users should be notified if it is missing. If you browse
the net, you see the message is present is in quite some logs. Better
remove it.
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20200625165210.14904-1-wsa@kernel.org

drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c

@@ -468,7 +468,7 @@ void iwl_dbg_tlv_load_bin(struct device *dev, struct iwl_trans *trans)
 	if (!iwlwifi_mod_params.enable_ini)
 		return;
 
-	res = request_firmware(&fw, "iwl-debug-yoyo.bin", dev);
+	res = firmware_request_nowarn(&fw, "iwl-debug-yoyo.bin", dev);
 	if (res)
 		return;