random: Fix whitespace pre random-bytes work

There are a couple of whitespace issues around the function
get_random_bytes_arch().  In preparation for patching this function
let's clean them up.

Acked-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Tobin C. Harding <me@tobin.cc>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>