Added check for the return value of the RAND_bytes() function

Call app_bail_out if RAND_bytes() fails.

Also changed the output parameter of RAND_bytes() to inp as
writing to encrypted output buffer does not make sense.

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Tom Cosgrove <tom.cosgrove@arm.com>
Reviewed-by: Paul Dale <pauli@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from #21706)

(cherry picked from commit 8d120ae)

apps/speed.c

@@ -3747,7 +3747,8 @@ static void multiblock_speed(const EVP_CIPHER *evp_cipher, int lengths_single,
             } else {
                 int pad;
 
-                RAND_bytes(out, 16);
+                if (RAND_bytes(inp, 16) <= 0)
+                    app_bail_out("error setting random bytes\n");
                 len += 16;
                 aad[11] = (unsigned char)(len >> 8);
                 aad[12] = (unsigned char)(len);