Fix compilation error.

Author: sunfishcode

crates/fuzzing/src/oracles.rs

@@ -375,7 +375,7 @@ pub fn make_api_calls(api: crate::generators::api::ApiCalls) {
 
                 let funcs = instance
                     .exports()
-                    .filter_map(|e| match e {
+                    .filter_map(|e| match e.into_extern() {
                         Extern::Func(f) => Some(f.clone()),
                         _ => None,
                     })