Correctly store last random word

pseudo_random_bytes() was accidentally copying the last partial long to
the beggining of the buffer instead of the end.  The final partial long
bytes weren't being filled.

Signed-off-by: Zach Brown <zab@versity.com>

utils/src/rand.c

@@ -25,6 +25,6 @@ void pseudo_random_bytes(void *data, unsigned int len)
 
 	if (len) {
 		__builtin_ia32_rdrand64_step(&tmp);
-		memcpy(data, &tmp, len);
+		memcpy(ll, &tmp, len);
 	}
 }