Fix potentially overrunning write of sprintf

[szsam]

Summary of changes

Format string "%d" requires 12 bytes (including the null terminator). Also, use snprintf instead of sprintf to prevent buffer overflow.

Impact of changes

Migration actions required

Documentation

None

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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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[0xc0170]

I am interested how couple of these were found - found via some software (as fixes touches various code bases). Nice finds.

[0xc0170]

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[mbed-ci]

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