fix: clippy unsafe issue

frontends/libretro/src/lib.rs

@@ -365,14 +365,17 @@ pub extern "C" fn retro_cheat_reset() {
     emulator.reset_cheats();
 }
 
+/// # Safety
+///
+/// This function should not be called only within Lib Retro context.
 #[no_mangle]
-pub extern "C" fn retro_cheat_set(_index: c_uint, enabled: bool, code: *const c_char) {
+pub unsafe extern "C" fn retro_cheat_set(_index: c_uint, enabled: bool, code: *const c_char) {
     debugln!("retro_cheat_set()");
     if !enabled {
         return;
     }
-    let emulator = unsafe { EMULATOR.as_mut().unwrap() };
-    let code_c = unsafe { CStr::from_ptr(code) };
+    let emulator = EMULATOR.as_mut().unwrap();
+    let code_c = CStr::from_ptr(code);
     let code_s = code_c.to_string_lossy().into_owned();
     emulator.add_cheat_code(&code_s).unwrap();
 }