f - add missed their_funding_contribution check

Author: jkczyz

lightning/src/ln/channel.rs

@@ -11008,8 +11008,16 @@ where
 
 		let their_funding_contribution = SignedAmount::from_sat(msg.funding_contribution_satoshis);
 		if their_funding_contribution > SignedAmount::MAX_MONEY {
-			return Err(ChannelError::Warn(format!(
-				"Channel {} cannot be spliced; their contribution exceeds total bitcoin supply: {}",
+			return Err(ChannelError::WarnAndDisconnect(format!(
+				"Channel {} cannot be spliced in; their {} contribution exceeds the total bitcoin supply",
+				self.context.channel_id(),
+				their_funding_contribution,
+			)));
+		}
+
+		if their_funding_contribution < -SignedAmount::MAX_MONEY {
+			return Err(ChannelError::WarnAndDisconnect(format!(
+				"Channel {} cannot be spliced out; their {} contribution exhausts the total bitcoin supply",
 				self.context.channel_id(),
 				their_funding_contribution,
 			)));