Keytrail shadowed in Walker

[GeorgeDuckman]

Hi,

I might have found an issue, sorry if I'm wrong, but the variable keytrail in the function walkBlock is shadowed by the function argument.

func (w *Walker) walkBlock(body *hclwrite.Body, queries []query.Query, index int, keytrail []string) error {
	for _, block := range body.Blocks() {
		blockIndex := index
		if !queries[blockIndex].Match(block.Type()) {
			continue
		}

		blockIndex++
		keytrail := append(keytrail, block.Type()) // Right there, should be '=' not ':='