travis: scancode ret value not cat fix

[0xc0170]

Summary of changes

This fixes the status like this: "travis-ci/licence_check — Needs review, 0 license issues found"

I was wondering why I can see it in new PRs. Because my last change to the travis made this possible, retval from cat was checked, not from scancode itself.

Impact of changes

Migration actions required

Documentation

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Pull request type

[X] Patch update (Bug fix / Target update / Docs update / Test update / Refactor)
[] Feature update (New feature / Functionality change / New API)
[] Major update (Breaking change E.g. Return code change / API behaviour change)

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Test results

[] No Tests required for this change (E.g docs only update)
[X] Covered by existing mbed-os tests (Greentea or Unittest)
[] Tests / results supplied as part of this PR

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Reviewers

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[ciarmcom]

@0xc0170, thank you for your changes.
@ARMmbed/mbed-os-maintainers please review.

[0xc0170]

Needs review, 0 license issues found

OK, have to fix it still 👀

[0xc0170]

I am adding some debug prints to travis to figure out why the ret value has unexpected value

[0xc0170]

I missed one print in there, removed. It should be fixed now and report properly the license count.

[0xc0170]

Travis restarted and CI started

[0xc0170]

I noticed the status was not set as I fixed the return code, pushed an update to address this. I'll restart CI