crypto/cipher-gnutls.c: Clean up local variable shadowing

crypto/cipher-gnutls.c: Clean up local variable shadowing

Fix:

  In file included from crypto/cipher.c:140:
  crypto/cipher-gnutls.c.inc: In function ‘qcrypto_gnutls_cipher_encrypt’:
  crypto/cipher-gnutls.c.inc:116:17: warning: declaration of ‘err’ shadows a previous local [-Wshadow=compatible-local]
    116 |             int err = gnutls_cipher_init(&handle, ctx->galg, &gkey, NULL);
        |                 ^~~
  crypto/cipher-gnutls.c.inc:94:9: note: shadowed declaration is here
     94 |     int err;
        |         ^~~
       ---

  crypto/cipher-gnutls.c.inc: In function ‘qcrypto_gnutls_cipher_decrypt’:
  crypto/cipher-gnutls.c.inc:177:17: warning: declaration of ‘err’ shadows a previous local [-Wshadow=compatible-local]
    177 |             int err = gnutls_cipher_init(&handle, ctx->galg, &gkey, NULL);
        |                 ^~~
  crypto/cipher-gnutls.c.inc:154:9: note: shadowed declaration is here
    154 |     int err;
        |         ^~~

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20230904161235.84651-17-philmd@linaro.org>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>