hal-tests-tests-mbed_hal-flash compilation warning

[jeromecoutant]

Summary of changes

Warning correction:

[DEBUG] Output: .\mbed-os\hal\tests\TESTS\mbed_hal\flash\functional_tests\main.cpp:273:8: warning: extra tokens at end of #endif directive [-Wextra-tokens]
[DEBUG] Output: #endif !DEVICE_FLASH

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]

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

[0xc0170]

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[mbed-ci]

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