chore: fix wasm warnings (#1312)

Author: meetmangukiya

Diff for: ethers-providers/src/pending_escalator.rs

@@ -190,7 +190,7 @@ where
                 poll_broadcast_fut!(cx, this, fut);
             }
             Sleeping(delay) => {
-                futures_util::ready!(delay.as_mut().poll(cx));
+                let _ready = futures_util::ready!(delay.as_mut().poll(cx));
                 // if broadcast timer has elapsed and if we have a TX to
                 // broadcast, broadcast it
                 if this.last.elapsed() > *this.broadcast_interval {

Diff for: ethers-providers/src/pending_transaction.rs

@@ -172,7 +172,7 @@ impl<'a, P: JsonRpcClient> Future for PendingTransaction<'a, P> {
 
         match this.state {
             PendingTxState::InitialDelay(fut) => {
-                futures_util::ready!(fut.as_mut().poll(ctx));
+                let _ready = futures_util::ready!(fut.as_mut().poll(ctx));
                 tracing::debug!("Starting to poll pending tx {:?}", *this.tx_hash);
                 let fut = Box::pin(this.provider.get_transaction(*this.tx_hash));
                 rewake_with_new_state!(ctx, this, PendingTxState::GettingTx(fut));