iwlwifi: remove unneeded goto from iwl_dbgfs_log_event_read

Make code simpler a bit.
Reported-by: NJonas Gorski <jogo@openwrt.org>
Signed-off-by: NStanislaw Gruszka <sgruszka@redhat.com>
Reviewed-by: NEmmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>

drivers/net/wireless/iwlwifi/dvm/debugfs.c

@@ -2241,10 +2241,8 @@ static ssize_t iwl_dbgfs_log_event_read(struct file *file,
 	ssize_t ret;
 
 	ret = iwl_dump_nic_event_log(priv, true, &buf);
-	if (ret < 0)
-		goto err;
-	ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
-err:
+	if (ret > 0)
+		ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
 	kfree(buf);
 	return ret;
 }