Fix compile error

crates/wasmtime/src/store.rs

@@ -902,7 +902,7 @@ impl Store {
  match self.block_on(unsafe { Pin::new_unchecked(&mut future) }) {
  // If this finished successfully then we were resumed normally via a
  // `poll`, so inject some more fuel and keep going.
- Ok(()) => self.add_fuel(fuel_to_inject),
+ Ok(()) => self.add_fuel(fuel_to_inject).unwrap(),
  // If the future was dropped while we were yielded, then we need to
  // clean up this fiber. Do so by raising a trap which will abort all
  // wasm and get caught on the other side to clean things up.