iwlwifi: use a format string for an snprintf()

This will make Kees Cook happy if we specify a format string and, who knows, maybe someday there will be a firmware version with a percent character and we'll be glad for this.

index 38de151..68efe97 100644
@@ -1296,7 +1296,7 @@ static void iwl_req_fw_callback(const struct firmware *ucode_raw, void *context)
 		iwl_dealloc_ucode(drv);
 
 		/* Build name of correct-step FW */
-		snprintf(firmware_name, sizeof(firmware_name),
+		snprintf(firmware_name, sizeof(firmware_name), "%s",
 			 strrchr(drv->firmware_name, '-'));
 		snprintf(drv->firmware_name, sizeof(drv->firmware_name),
 			 "%s%s", drv->cfg->fw_name_pre, firmware_name);

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