crypto: Change the qcrypto_random_bytes buffer type to void*

Using uint8_t* merely requires useless casts for use with
other types to be filled with randomness.

Reviewed-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

include/crypto/random.h

@@ -34,7 +34,7 @@
  *
  * Returns 0 on success, -1 on error
  */
-int qcrypto_random_bytes(uint8_t *buf,
+int qcrypto_random_bytes(void *buf,
                          size_t buflen,
                          Error **errp);