dco-win: fix broken ASSERT in dco_new_key

Commit

  e77c343 ("dco_win: In dco_new_key, document size assumptions for the integer casts")

has added an ASSERT on key-id, but didn't take into account that
key-id 0 is a perfectly valid value and is the first key-id. This
essentially broke dco-win.

Fix by adjusting ASSERT to >= 0.

Change-Id: I3b1243461ec9b6e85897f452f78dc4b05f7e126d
Signed-off-by: Lev Stipakov <[email protected]>
Acked-by: Frank Lichtenheld <[email protected]>
Gerrit URL: https://gerrit.openvpn.net/c/openvpn/+/1223
Message-Id: <[email protected]>
URL: https://sourceforge.net/p/openvpn/mailman/message/59240115/
Signed-off-by: Gert Doering <[email protected]>

Author: lstipakov

src/openvpn/dco_win.c

@@ -541,7 +541,7 @@ dco_new_key(dco_context_t *dco, unsigned int peerid, int keyid, dco_key_slot_t s
     ZeroMemory(&crypto_data, sizeof(crypto_data));
 
     crypto_data.CipherAlg = dco_get_cipher(ciphername);
-    ASSERT(keyid > 0 && keyid <= UCHAR_MAX);
+    ASSERT(keyid >= 0 && keyid <= UCHAR_MAX);
     crypto_data.KeyId = (unsigned char)keyid;
     crypto_data.PeerId = peerid;
     crypto_data.KeySlot = slot;