[riot-notifications] [RIOT-OS/RIOT] tests/malloc: fail if allocation count does not match (#15476)

[benpicco]

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### Contribution description

If we can't allocate the same amount of buffers in the second run, fail the test.
This indicates that not all buffers have been properly freed.


### Testing procedure

`tests/malloc` should still work, but will fail if you use the `oneway_malloc` module (you'll have to delete `sys/oneway-malloc/include/malloc.h` for it to compile) 



### Issues/PRs references

discovered during #15474

You can view, comment on, or merge this pull request online at:

  https://github.com/RIOT-OS/RIOT/pull/15476

-- Commit Summary --

  * tests/malloc: fail if allocation count does not match

-- File Changes --

    M tests/malloc/main.c (16)

-- Patch Links --

https://github.com/RIOT-OS/RIOT/pull/15476.patch
https://github.com/RIOT-OS/RIOT/pull/15476.diff

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