Use saturating_add to prevent overflow

Cargo.toml

@@ -24,7 +24,7 @@ log = "0.4.11"
 libc = "0.2.77"
 
 [target.'cfg(windows)'.dependencies]
-wepoll-sys = "2.0.0"
+wepoll-sys = { path = "../wepoll" }
 winapi = { version = "0.3.9", features = ["ioapiset", "winsock2"] }
 
 [dev-dependencies]

src/wepoll.rs

@@ -81,8 +81,8 @@ impl Poller {
             Some(t) => {
                 // Round up to a whole millisecond.
                 let mut ms = t.as_millis().try_into().unwrap_or(std::u64::MAX);
-                if Duration::from_millis(ms) < t {
-                    ms += 1;
+                if Duration::from_millis(ms as u64) < t {
+                    ms = ms.saturating_add(1);
                 }
                 ms.try_into().unwrap_or(std::i32::MAX)
             }