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: Roel Kluin <roel.kluin@gmail.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

crypto/ansi_cprng.c

diff --git a/crypto/ansi_cprng.c b/crypto/ansi_cprng.c
index 027176a..45bd218 100644
--- a/crypto/ansi_cprng.c
+++ b/crypto/ansi_cprng.c
@@ -193,9 +193,6 @@
 	int err;
 
 
-	if (nbytes < 0)
-		return -EINVAL;
-
 	spin_lock_bh(&ctx->prng_lock);
 
 	err = -EINVAL;