rust: return u32 from insn_in_hook callback

bindings/rust/src/ffi.rs

@@ -181,7 +181,7 @@ pub extern "C" fn insn_in_hook_proxy<D, F>(
     size: usize,
     user_data: *mut UcHook<D, F>,
 ) where
-    F: FnMut(&mut crate::Unicorn<D>, u32, usize),
+    F: FnMut(&mut crate::Unicorn<D>, u32, usize) -> u32,
 {
     let user_data = unsafe { &mut *user_data };
     debug_assert_eq!(uc, user_data.uc.get_handle());

bindings/rust/src/lib.rs

@@ -758,7 +758,7 @@ impl<'a, D> Unicorn<'a, D> {
     /// Add hook for x86 IN instruction.
     pub fn add_insn_in_hook<F: 'a>(&mut self, callback: F) -> Result<ffi::uc_hook, uc_error>
     where
-        F: FnMut(&mut Unicorn<D>, u32, usize),
+        F: FnMut(&mut Unicorn<D>, u32, usize) -> u32,
     {
         let mut hook_ptr = core::ptr::null_mut();
         let mut user_data = Box::new(ffi::UcHook {