Merge pull request #15018 from jeromecoutant/PR_FLASHTEST

hal-tests-tests-mbed_hal-flash compilation warning

Author: 0xc0170

hal/tests/TESTS/mbed_hal/flash/functional_tests/main.cpp

@@ -270,4 +270,4 @@ int main()
     Harness::run(specification);
 }
 
-#endif !DEVICE_FLASH
+#endif // !DEVICE_FLASH