Remove dual_funding cfg

Author: optout21

lightning/src/ln/channel.rs

@@ -3651,7 +3651,7 @@ impl<SP: Deref> ChannelContext<SP> where SP::Target: SignerProvider {
 	/// Check that a balance value meets the channel reserve requirements or violates them (below reserve).
 	/// The channel value is an input as opposed to using from self, so that this can be used in case of splicing
 	/// to checks with new channel value (before being comitted to it).
-	#[cfg(any(dual_funding, splicing))]
+	#[cfg(splicing)]
 	pub fn check_balance_meets_reserve_requirements(&self, balance: u64, channel_value: u64) -> Result<(), ChannelError> {
 		if balance == 0 {
 			return Ok(());