Fix lightning-rapid-gossip-sync warnings.

Author: arik-so

lightning-rapid-gossip-sync/src/lib.rs

@@ -74,8 +74,6 @@ use lightning::io;
 use lightning::ln::msgs::{DecodeError, LightningError};
 use lightning::routing::gossip::NetworkGraph;
 use lightning::util::logger::Logger;
-#[cfg(feature = "std")]
-use std::fs::File;
 
 /// Core functionality of this crate
 mod processing;
@@ -145,11 +143,11 @@ where
 	///
 	/// `sync_path`: Path to the file where the gossip update data is located
 	///
-	#[cfg(feature = "std")]
+	#[cfg(all(feature = "std", not(feature = "no-std")))]
 	pub fn sync_network_graph_with_file_path(
 		&self, sync_path: &str,
 	) -> Result<u32, GraphSyncError> {
-		let file = File::open(sync_path).map_err(|e| {
+		let file = std::fs::File::open(sync_path).map_err(|e| {
 			let bitcoin_error: bitcoin::io::Error = e.into();
 			bitcoin_error
 		})?;
@@ -193,7 +191,7 @@ where
 	}
 }
 
-#[cfg(feature = "std")]
+#[cfg(all(feature = "std", not(feature = "no-std")))]
 #[cfg(test)]
 mod tests {
 	use std::fs;