memzone: fix race condition on alloc failure

Deallocation used the wrong function, which could have resulted in
race conditions because the function does not use locks internally.

Fixes: 1403f87d4fb8 ("malloc: enable memory hotplug support")

Signed-off-by: Anatoly Burakov <anatoly.burakov@intel.com>
Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com>

lib/librte_eal/common/eal_common_memzone.c

@@ -205,7 +205,7 @@ memzone_reserve_aligned_thread_unsafe(const char *name, size_t len,
 
 	if (mz == NULL) {
 		RTE_LOG(ERR, EAL, "%s(): Cannot find free memzone\n", __func__);
-		malloc_elem_free(elem);
+		malloc_heap_free(elem);
 		rte_errno = ENOSPC;
 		return NULL;
 	}