snmpapi: Test and correct SnmpUtilOidNCmp when count is less than Oid length.

dlls/snmpapi/main.c

@@ -356,6 +356,7 @@ INT WINAPI SnmpUtilOidNCmp(AsnObjectIdentifier *oid1, AsnObjectIdentifier *oid2,
         if (oid1->ids[i] > oid2->ids[i]) return 1;
         if (oid1->ids[i] < oid2->ids[i]) return -1;
     }
+    if (i == count) return 0;
     if (oid1->idLength < oid2->idLength) return -1;
     if (oid1->idLength > oid2->idLength) return 1;
     return 0;

dlls/snmpapi/tests/util.c

@@ -330,6 +330,11 @@ static void test_SnmpUtilOidNCmp(void)
     ok(ret == 1, "SnmpUtilOidNCmp failed: %d\n", ret);
     ret = SnmpUtilOidNCmp(&oid1, &oid2, 4);
     ok(ret == -1, "SnmpUtilOidNCmp failed: %d\n", ret);
+
+    ret = SnmpUtilOidNCmp(&oid1, &oid2, 2);
+    ok(!ret, "SnmpUtilOidNCmp failed: %d\n", ret);
+    ret = SnmpUtilOidNCmp(&oid2, &oid1, 2);
+    ok(!ret, "SnmpUtilOidNCmp failed: %d\n", ret);
 }
 
 static void test_SnmpUtilOidCmp(void)