Add fuzzer for cpio

Issue: #160

Signed-off-by: Andrew Gunnerson <accounts+github@chiller3.com>

fuzz/src/bin/cpio.rs

@@ -0,0 +1,21 @@
+#[cfg(not(windows))]
+mod fuzz {
+    use std::io::Cursor;
+
+    use avbroot::format::cpio;
+    use honggfuzz::fuzz;
+
+    pub fn main() {
+        loop {
+            fuzz!(|data: &[u8]| {
+                let reader = Cursor::new(data);
+                let _ = cpio::load(reader, true);
+            });
+        }
+    }
+}
+
+fn main() {
+    #[cfg(not(windows))]
+    fuzz::main();
+}