Fix & fmt::Debug

Author: Thomasdezeeuw

src/sys/unix.rs

@@ -2828,7 +2828,15 @@ pub struct SockFilter {
 impl SockFilter {
     /// Create new `SockFilter`.
     pub fn new(code: u16, jt: u8, jf: u8, k: u32) -> SockFilter {
-        SockFilter { code, jt, jf, k }
+        SockFilter {
+            filter: libc::sock_filter { code, jt, jf, k },
+        }
+    }
+}
+
+impl std::fmt::Debug for SockFilter {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.debug_struct("SockFilter").finish_non_exhaustive()
     }
 }