[riot-notifications] [RIOT-OS/RIOT] tests/malloc: fix of dereferencing a NULL pointer (#11245)

Gunar Schorcht notifications at github.com
Sat Mar 23 14:05:14 CET 2019

### Contribution description

If the memory is exhausted during the allocation of the new `head` structure, subsequent accesses to `head` will result in dereferencing of a NULL pointer. This PR fixes the problem.

### Testing procedure

Compile and flash `tests/malloc` for any board and observe the results. The application should still work.
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-- Commit Summary --

  * tests/malloc: fix of dereferencing a NULL pointer

-- File Changes --

    M tests/malloc/main.c (6)

-- Patch Links --


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