[Bug c/59933] for loop goes wild with assert() enabled

[warnerme at ptd dot net]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59933

--- Comment #5 from Mark Warner <warnerme at ptd dot net> ---
sizeof(NSQ_del_dec_struct) / sizeof(opus_int32) is guaranteed to produced a
even number with a remainder of 0.
Note the __attribute__ ((__aligned__ (8))) to make it a multiple of 8 in size.