strengthen alignment check for memalign and aligned_alloc

src/alloc-aligned.c

@@ -20,7 +20,7 @@ static void* mi_heap_malloc_zero_aligned_at(mi_heap_t* const heap, const size_t
   mi_assert(alignment > 0 && alignment % sizeof(void*) == 0);
 
   if (mi_unlikely(size > PTRDIFF_MAX)) return NULL;   // we don't allocate more than PTRDIFF_MAX (see <https://sourceware.org/ml/libc-announce/2019/msg00001.html>)
-  if (mi_unlikely(alignment==0 || !_mi_is_power_of_two(alignment))) return NULL; // require power-of-two (see <https://en.cppreference.com/w/c/memory/aligned_alloc>)  
+  if (mi_unlikely(alignment==0 || !_mi_is_power_of_two(alignment))) return NULL; // require power-of-two (see <https://en.cppreference.com/w/c/memory/aligned_alloc>)
   const uintptr_t align_mask = alignment-1;  // for any x, `(x & align_mask) == (x % alignment)`
   
   // try if there is a small block available with just the right alignment