Remove unnecessary unsafe block in process_unix

Author: LeSeulArtichaut

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

@@ -552,8 +552,7 @@ impl Process {
         use crate::os::unix::io::FromRawFd;
         use crate::sys_common::FromInner;
         // Safety: If `pidfd` is nonnegative, we assume it's valid and otherwise unowned.
-        let pidfd = (pidfd >= 0)
-            .then(|| PidFd::from_inner(unsafe { sys::fd::FileDesc::from_raw_fd(pidfd) }));
+        let pidfd = (pidfd >= 0).then(|| PidFd::from_inner(sys::fd::FileDesc::from_raw_fd(pidfd)));
         Process { pid, status: None, pidfd }
     }