chore: Fix warnings from signal being only variant

Signed-off-by: John Nunley <dev@notgull.net>

src/reaper/mod.rs

@@ -9,6 +9,8 @@
 //! test to see if pidfd is supported first. If it is, we use wait. If not, we use
 //! signal.
 
+#![allow(irrefutable_let_patterns)]
+
 /// Enable the waiting reaper.
 #[cfg(any(target_os = "linux", target_os = "android"))]
 macro_rules! cfg_wait {

src/reaper/signal.rs

@@ -175,8 +175,13 @@ cfg_if::cfg_if! {
             /// Register a process object into this pipe.
             fn register(&self, child: &std::process::Child) -> io::Result<()> {
                 // Called when a child exits.
+                #[allow(clippy::infallible_destructuring_match)]
                 unsafe extern "system" fn callback(_: *mut c_void, _: BOOLEAN) {
-                    crate::Reaper::get().sys.pipe.sender.try_send(()).ok();
+                    let reaper = match &crate::Reaper::get().sys {
+                        super::Reaper::Signal(reaper) => reaper,
+                    };
+
+                    reaper.pipe.sender.try_send(()).ok();
                 }
 
                 // Register this child process to invoke `callback` on exit.