Use assert in wapp_mem_util_align_forward instead of returning NULL

src/core/mem/utils/mem_utils.c

@@ -7,11 +7,8 @@
 internal bool is_power_of_two(u64 num) { return (num & (num - 1)) == 0; }
 
 void *wapp_mem_util_align_forward(void *ptr, u64 alignment) {
-  if (!ptr) {
-    return NULL;
-  }
-
-  assert(is_power_of_two(alignment));
+  assert(ptr != NULL && "ptr argument shouldn't be NULL");
+  assert(is_power_of_two(alignment) && "Alignment isn't a power of 2");
 
   uptr p = (uptr)ptr;
   uptr align = (uptr)alignment;