Rollup merge of rust-lang#95058 - wcampbell0x2a:use-then-in-unix-proc…

…ess, r=dtolnay

Add use of bool::then in sys/unix/process

Remove `else { None }` in favor of using `bool::then()`

library/std/src/sys/unix/process/process_unix.rs

@@ -648,19 +648,19 @@ impl ExitStatus {
     }
 
     pub fn code(&self) -> Option<i32> {
-        if self.exited() { Some(libc::WEXITSTATUS(self.0)) } else { None }
+        self.exited().then(|| libc::WEXITSTATUS(self.0))
     }
 
     pub fn signal(&self) -> Option<i32> {
-        if libc::WIFSIGNALED(self.0) { Some(libc::WTERMSIG(self.0)) } else { None }
+        libc::WIFSIGNALED(self.0).then(|| libc::WTERMSIG(self.0))
     }
 
     pub fn core_dumped(&self) -> bool {
         libc::WIFSIGNALED(self.0) && libc::WCOREDUMP(self.0)
     }
 
     pub fn stopped_signal(&self) -> Option<i32> {
-        if libc::WIFSTOPPED(self.0) { Some(libc::WSTOPSIG(self.0)) } else { None }
+        libc::WIFSTOPPED(self.0).then(|| libc::WSTOPSIG(self.0))
     }
 
     pub fn continued(&self) -> bool {