crypto: ansi_cprng - Fix test in get_prng_bytes

size_t nbytes cannot be less than 0 and the test was redundant.
Signed-off-by: NRoel Kluin <roel.kluin@gmail.com>
Acked-by: NNeil Horman <nhorman@tuxdriver.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

crypto/ansi_cprng.c

@@ -193,9 +193,6 @@ static int get_prng_bytes(char *buf, size_t nbytes, struct prng_context *ctx,
 	int err;
 
 
-	if (nbytes < 0)
-		return -EINVAL;
-
 	spin_lock_bh(&ctx->prng_lock);
 
 	err = -EINVAL;