One more ASAN/MSAN cleanup

commit 48493132 included a
workaround for a 10.5 merge issue that should now be properly
addressed in commit ab406990.

buf_chunk_init(): Remove an unnecessary MEM_MAKE_ADDRESSABLE().
We might invoke MEM_UNDEFINED() here, but actually the allocated
memory ought to be guaranteed to be zero-initialized.

storage/innobase/buf/buf0buf.cc

@@ -1622,8 +1622,6 @@ buf_chunk_init(
 		return(NULL);
 	}
 
-	MEM_MAKE_ADDRESSABLE(chunk->mem, chunk->mem_size());
-
 #ifdef HAVE_LIBNUMA
 	if (srv_numa_interleave) {
 		struct bitmask *numa_mems_allowed = numa_get_mems_allowed();