Check error return from cms_sd_asn1_ctrl() correctly.

Fixes #21986

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/21988)

crypto/cms/cms_sd.c

@@ -262,13 +262,13 @@ static int cms_sd_asn1_ctrl(CMS_SignerInfo *si, int cmd)
     int i;
 
     if (EVP_PKEY_is_a(pkey, "DSA") || EVP_PKEY_is_a(pkey, "EC"))
-        return cms_generic_sign(si, cmd);
+        return cms_generic_sign(si, cmd) > 0;
     else if (EVP_PKEY_is_a(pkey, "RSA") || EVP_PKEY_is_a(pkey, "RSA-PSS"))
-        return ossl_cms_rsa_sign(si, cmd);
+        return ossl_cms_rsa_sign(si, cmd) > 0;
 
     /* Now give engines, providers, etc a chance to handle this */
     if (pkey->ameth == NULL || pkey->ameth->pkey_ctrl == NULL)
-        return cms_generic_sign(si, cmd);
+        return cms_generic_sign(si, cmd) > 0;
     i = pkey->ameth->pkey_ctrl(pkey, ASN1_PKEY_CTRL_CMS_SIGN, cmd, si);
     if (i == -2) {
         ERR_raise(ERR_LIB_CMS, CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);