Commit() ignores errors

[LongHairedHacker]

Seems like I found another bug.
I've just noticed that in case of an error writing to the config file (e.g. permission problem, out of disk space ...) Commit() still returns nil.

go-uci/uci.go

Lines 110 to 121 in a970c4b

	func (t *tree) Commit() error {
	t.Lock()
	defer t.Unlock()
	for _, config := range t.configs {
	if !config.tainted {
	continue
	}
	t.saveConfig(config)
	}
	return nil
	}

It ignores any errors returned by t.saveConfig(config).

I'll have a pull request ready in a few moments.

[dmke]

Fixed with #5. Thank you!