Clarify our UnsafeCell shenanigans

Author: FenrirWolf

ctru-rs/src/applets/error.rs

@@ -107,7 +107,9 @@ impl PanicHookConfig {
         }
     }
 
-    unsafe fn get(&self) -> *mut errorConf {
+    // There can only be one invocation of an applet active at any given time, so our `UnsafeCell`
+    // crimes *should* be okay here.
+    unsafe fn get(&self) -> &mut errorConf {
         unsafe { (*self.error_app.get()).state.as_mut() }
     }
 }
@@ -130,7 +132,7 @@ pub(crate) fn set_panic_hook(call_old_hook: bool) {
                 old_hook(panic_info);
             }
 
-            let error_conf = unsafe { &mut *config.get() };
+            let error_conf = unsafe { config.get() };
 
             let mut buf1 = itoa::Buffer::new();