crypt32/tests: Test some return values (clang).

dlls/crypt32/tests/cert.c

@@ -1514,6 +1514,7 @@ static void testGetIssuerCert(void)
     /* With only the child certificate, no issuer will be found */
     ret = CertAddEncodedCertificateToStore(store, X509_ASN_ENCODING,
      chain7_1, sizeof(chain7_1), CERT_STORE_ADD_ALWAYS, &child);
+    ok(ret, "CertAddEncodedCertificateToStore failed: %08x\n", GetLastError());
     parent = CertGetIssuerCertificateFromStore(store, child, NULL, &flags);
     ok(parent == NULL, "Expected no issuer\n");
     /* Adding an issuer allows one (and only one) issuer to be found */

dlls/crypt32/tests/msg.c

@@ -3253,6 +3253,7 @@ static void test_msg_control(void)
          "Expected E_INVALIDARG, got %08x\n", GetLastError());
     }
     ret = CryptMsgUpdate(msg, NULL, 0, TRUE);
+    ok(ret, "CryptMsgUpdate failed: %08x\n", GetLastError());
     /* or after an update. */
     for (i = 1; !old_crypt32 && (i <= CMSG_CTRL_ADD_CMS_SIGNER_INFO); i++)
     {

dlls/crypt32/tests/store.c

@@ -1171,6 +1171,7 @@ static void testSystemStore(void)
     /* Now check whether deleting is allowed */
     store = CertOpenStore(CERT_STORE_PROV_SYSTEM, 0, 0,
      CERT_SYSTEM_STORE_CURRENT_USER | CERT_STORE_DELETE_FLAG, BogusW);
+    ok(!store, "Didn't expect a store to be returned when deleting\n");
     RegDeleteKeyW(HKEY_CURRENT_USER, BogusPathW);
 }
 
@@ -2243,6 +2244,8 @@ static void testAddCertificateLink(void)
         if (buf)
         {
             ret = CertSerializeCertificateStoreElement(linked, 0, buf, &size);
+            ok(ret, "CertSerializeCertificateStoreElement failed: %08x\n",
+             GetLastError());
             /* The serialized linked certificate is identical to the serialized
              * original certificate.
              */