mm: Convert DEBUGASSERT(false) into more intuitive DEBUGPANIC()

Signed-off-by: Gustavo Henrique Nihei <gustavo.nihei@espressif.com>

mm/mm_heap/mm_realloc.c

@@ -97,7 +97,7 @@ FAR void *mm_realloc(FAR struct mm_heap_s *heap, FAR void *oldmem,
     {
       /* There must have been an integer overflow */
 
-      DEBUGASSERT(false);
+      DEBUGPANIC();
       return NULL;
     }