fix: correct typo in SSM package.

[garnertb]

What does this implement/fix? Explain your changes.

Infinite loop in @middy/ssm caused by typo recursion logic.

Does this close any currently open issues?

No.

Any relevant logs, error output, etc?

fetchPath would infinitely iterate when there were > 10 parameters because the nextToken was undefined. Below is a test case with 11 parameters.

//const fetchPath = (path, nextToken, values = {}) => {
fetchPath i:0, nextToken: undefined, values length: 0
fetchPath i:1, nextToken: undefined, values length: 10
fetchPath i:2, nextToken: undefined, values length: 10
fetchPath i:3, nextToken: undefined, values length: 10
...

After:

fetchPath i:0, nextToken: undefined, values length: 0
fetchPath i:1, nextToken: <token value>, values length: 10
done.

[willfarrell]

Thanks for the PR and good catch! I'll put a release together this weekend.