When receiving packets on client links, try INIT decryption first.
If it fails (e.g., for INIT_RESPONSE packets), fallback to normal
decryption using the existing link's crypto context.
This fixes mesh topology where both nodes send INIT simultaneously,
while maintaining compatibility with standard client-server mode where
client links receive INIT_RESPONSE packets.
Changes:
- If link==NULL OR link is client (is_server==0), try INIT decryption
- On any INIT decryption error, if we have an existing link, goto normal_decrypt
- Added normal_decrypt label before standard packet processing
- This allows handling both incoming INIT (create server link) and
incoming responses (use existing client link) correctly
Evgeny
27b02cef68