validate pointer before assertion in mi_free_size (issue #754)

src/free.c

@@ -340,7 +340,11 @@ mi_decl_nodiscard size_t mi_usable_size(const void* p) mi_attr_noexcept {
 
 void mi_free_size(void* p, size_t size) mi_attr_noexcept {
   MI_UNUSED_RELEASE(size);
+  #if MI_DEBUG
+  mi_segment_t* const segment = mi_checked_ptr_segment(p,"mi_free_size");
+  if mi_unlikely(segment==NULL) return;
   mi_assert(p == NULL || size <= _mi_usable_size(p,"mi_free_size"));
+  #endif
   mi_free(p);
 }