refactor: fix clippy warnings

kernel/src/proc/process.rs

@@ -410,7 +410,7 @@ impl Process {
         let mut data_offset = 0usize;
         for arg in argv.iter() {
             // XXX this is really unsafe and I am not really sure ABI will stay like this XXX
-            Self::write_paged(space, base + offset + 0, base + data_offset)?;
+            Self::write_paged(space, base + offset, base + data_offset)?;
             Self::write_paged(space, base + offset + 8, arg.len())?;
             offset += 16;
             data_offset += arg.len();

kernel/src/proc/thread.rs

@@ -237,6 +237,7 @@ impl Thread {
 
     /// Changes process wait condition status
     pub fn setup_wait(&self, wait: *const Wait) {
+        #![allow(clippy::not_unsafe_ptr_arg_deref)]
         let mut lock = self.inner.lock();
         // FIXME this is not cool
         lock.pending_wait = Some(unsafe { &*wait });

kernel/src/proc/wait.rs

@@ -83,8 +83,12 @@ pub fn select(
     }
     let read = rfds.as_deref().map(FdSet::clone);
     let write = wfds.as_deref().map(FdSet::clone);
-    rfds.as_deref_mut().map(FdSet::reset);
-    wfds.as_deref_mut().map(FdSet::reset);
+    if let Some(rfds) = &mut rfds {
+        rfds.reset();
+    }
+    if let Some(wfds) = &mut wfds {
+        wfds.reset();
+    }
 
     let deadline = timeout.map(|v| v + machine::local_timer().timestamp().unwrap());
     let proc = thread.owner().unwrap();