Handle if funding transaction is in a coinbase transaction

Author: benthecarman

lightning/src/ln/channel.rs

@@ -4924,6 +4924,10 @@ impl<Signer: Sign> Channel<Signer> {
 			self.funding_tx_confirmation_height = 0;
 		}
 
+		if self.funding_transaction.map(|t| t.is_coin_base()).unwrap_or(false) && funding_tx_confirmations <= 100 {
+			return None;
+		}
+
 		if funding_tx_confirmations < self.minimum_depth.unwrap_or(0) as i64 {
 			return None;
 		}