wifi: iwlwifi: Use request_module_nowait

This appears to work around a deadlock regression that came in
with the LED merge in 6.9.

The deadlock happens on my system with 24 iwlwifi radios, so maybe
it something like all worker threads are busy and some work that needs
to complete cannot complete.

Link: https://lore.kernel.org/linux-kernel/20240411070718.GD6194@google.com/
Fixes: f5c31bcf ("Merge tag 'leds-next-6.9' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/leds")
Signed-off-by: Ben Greear <greearb@candelatech.com>
Link: https://msgid.link/20240430234212.2132958-1-greearb@candelatech.com
[also remove unnecessary "load_module" var and now-wrong comment]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

drivers/net/wireless/intel/iwlwifi/iwl-drv.c

@@ -1484,7 +1484,6 @@ static void iwl_req_fw_callback(const struct firmware *ucode_raw, void *context)
 	size_t trigger_tlv_sz[FW_DBG_TRIGGER_MAX];
 	u32 api_ver;
 	int i;
-	bool load_module = false;
 	bool usniffer_images = false;
 	bool failure = true;
 
@@ -1732,19 +1731,12 @@ static void iwl_req_fw_callback(const struct firmware *ucode_raw, void *context)
 			goto out_unbind;
 		}
 	} else {
-		load_module = true;
+		request_module_nowait("%s", op->name);
 	}
 	mutex_unlock(&iwlwifi_opmode_table_mtx);
 
 	complete(&drv->request_firmware_complete);
 
-	/*
-	 * Load the module last so we don't block anything
-	 * else from proceeding if the module fails to load
-	 * or hangs loading.
-	 */
-	if (load_module)
-		request_module("%s", op->name);
 	failure = false;
 	goto free;