Miscellaneous clippy fixes.

src/hostcalls/misc.rs

@@ -7,7 +7,7 @@ use log::trace;
 use wasi_common_cbindgen::wasi_common_cbindgen;
 
 #[wasi_common_cbindgen]
-pub fn proc_exit(rval: wasm32::__wasi_exitcode_t) -> () {
+pub fn proc_exit(rval: wasm32::__wasi_exitcode_t) {
     trace!("proc_exit(rval={:?})", rval);
     // TODO: Rather than call std::process::exit here, we should trigger a
     // stack unwind similar to a trap.

src/sys/unix/hostcalls_impl/misc.rs

@@ -63,7 +63,7 @@ pub(crate) fn clock_time_get(clock_id: host::__wasi_clockid_t) -> Result<host::_
     (timespec.tv_sec as host::__wasi_timestamp_t)
         .checked_mul(1_000_000_000)
         .and_then(|sec_ns| sec_ns.checked_add(timespec.tv_nsec as host::__wasi_timestamp_t))
-        .map_or(Err(Error::EOVERFLOW), |time| Ok(time))
+        .map_or(Err(Error::EOVERFLOW), Ok)
 }
 
 pub(crate) fn poll_oneoff(