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Update a stale comment for dav1d_alloc_aligned()

Also, the assertion that 'align'  is a power of 2 can be used by all
cases in dav1d_alloc_aligned().

--- a/include/common/mem.h

+++ b/include/common/mem.h

@@ -37,13 +37,13 @@

 #include "common/attributes.h"

 /*

- * Allocate 32-byte aligned memory. The return value can be released

- * by calling the standard free() function.

+ * Allocate align-byte aligned memory. The return value can be released

+ * by calling the dav1d_free_aligned() function.

  */

 static inline void *dav1d_alloc_aligned(size_t sz, size_t align) {

+    assert(!(align & (align - 1)));

 #ifdef HAVE_POSIX_MEMALIGN

     void *ptr;

-    assert(!(align & (align - 1)));

     if (posix_memalign(&ptr, align, sz)) return NULL;

     return ptr;

 #elif defined(HAVE_ALIGNED_MALLOC)