Merge pull request #68 from rust-osdev/fix-build-on-stable

Fix build on stable by adding missing field in `HoleList` initializer

Author: phil-opp

src/hole.rs

@@ -266,6 +266,7 @@ impl HoleList {
             },
             bottom: null_mut(),
             top: null_mut(),
+            pending_extend: 0,
         }
     }