rust/applayer: use c_int as return type for get_info_by_id

Rust was using i8 as the return type, while C uses int. As of Rust
1.82, the return value is turned to garbage over the FFI boundary.

Ticket: #7338
(cherry picked from commit 45384ef969)

rust/derive/src/applayerevent.rs

@@ -98,7 +98,7 @@ pub fn derive_app_layer_event(input: TokenStream) -> TokenStream {
                 event_id: std::os::raw::c_int,
                 event_name: *mut *const std::os::raw::c_char,
                 event_type: *mut #crate_id::core::AppLayerEventType,
-            ) -> i8 {
+            ) -> std::os::raw::c_int {
                 #crate_id::applayer::get_event_info_by_id::<#name>(event_id, event_name, event_type)
             }
 

rust/src/applayer.rs

@@ -445,7 +445,7 @@ pub type StateGetTxFn            = unsafe extern "C" fn (*mut c_void, u64) -> *m
 pub type StateGetTxCntFn         = unsafe extern "C" fn (*mut c_void) -> u64;
 pub type StateGetProgressFn = unsafe extern "C" fn (*mut c_void, u8) -> c_int;
 pub type GetEventInfoFn     = unsafe extern "C" fn (*const c_char, *mut c_int, *mut AppLayerEventType) -> c_int;
-pub type GetEventInfoByIdFn = unsafe extern "C" fn (c_int, *mut *const c_char, *mut AppLayerEventType) -> i8;
+pub type GetEventInfoByIdFn = unsafe extern "C" fn (c_int, *mut *const c_char, *mut AppLayerEventType) -> c_int;
 pub type LocalStorageNewFn  = extern "C" fn () -> *mut c_void;
 pub type LocalStorageFreeFn = extern "C" fn (*mut c_void);
 pub type GetTxFilesFn       = unsafe extern "C" fn (*mut c_void, *mut c_void, u8) -> AppLayerGetFileState;
@@ -587,7 +587,7 @@ pub trait AppLayerEvent {
         event_id: std::os::raw::c_int,
         event_name: *mut *const std::os::raw::c_char,
         event_type: *mut core::AppLayerEventType,
-    ) -> i8;
+    ) -> std::os::raw::c_int;
 }
 
 /// Generic `get_info_info` implementation for enums implementing
@@ -631,7 +631,7 @@ pub unsafe fn get_event_info_by_id<T: AppLayerEvent>(
     event_id: std::os::raw::c_int,
     event_name: *mut *const std::os::raw::c_char,
     event_type: *mut core::AppLayerEventType,
-) -> i8 {
+) -> std::os::raw::c_int {
     if let Some(e) = T::from_id(event_id) {
         *event_name = e.to_cstring().as_ptr() as *const std::os::raw::c_char;
         *event_type = core::AppLayerEventType::APP_LAYER_EVENT_TYPE_TRANSACTION;

rust/src/smb/smb.rs

@@ -2229,7 +2229,7 @@ pub unsafe extern "C" fn rs_smb_state_get_event_info_by_id(
     event_id: std::os::raw::c_int,
     event_name: *mut *const std::os::raw::c_char,
     event_type: *mut AppLayerEventType,
-) -> i8 {
+) -> std::os::raw::c_int {
     SMBEvent::get_event_info_by_id(event_id, event_name, event_type)
 }