Otherwise the local mallocs variable is not decremented correctly (if TEST_SUITES is defined) and the fuzzing setup (i.e. when MODULE_FUZZING is defined) does not terminate. This regression was introduced in 3970b667aade062ab9dc4e2afe7914f7cd081f80.
Implement gnrc_pktbuf_release_error() in gnrc_pktbuf once, rather than providing two implementations in gnrc_pktbuf_static and gnrc_pktbuf_malloc