crypto: gcm - Fix error return code in crypto_gcm_create_common()

BugLink: https://bugs.launchpad.net/bugs/1832661

commit 9b40f79c upstream.

Fix to return error code -EINVAL from the invalid alg ivsize error
handling case instead of 0, as done elsewhere in this function.
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

crypto/gcm.c

@@ -670,11 +670,11 @@ static int crypto_gcm_create_common(struct crypto_template *tmpl,
 	ctr = crypto_skcipher_spawn_alg(&ctx->ctr);
 
 	/* We only support 16-byte blocks. */
+	err = -EINVAL;
 	if (ctr->cra_ablkcipher.ivsize != 16)
 		goto out_put_ctr;
 
 	/* Not a stream cipher? */
-	err = -EINVAL;
 	if (ctr->cra_blocksize != 1)
 		goto out_put_ctr;