Revert "lint: remove unecessary option (but refrain from adding another trait impl)"

This reverts commit 7ac0afa63aa373a540d9968d358e973ebce63c70.

src/fs/file.rs

@@ -533,11 +533,11 @@ impl<'dir> File<'dir> {
             }
 
             let duration = Duration::new(sec.unsigned_abs(), nanosec.unsigned_abs() as u32);
-            UNIX_EPOCH - duration
+            Some(UNIX_EPOCH - duration)
         }
         else {
             let duration = Duration::new(sec as u64, nanosec as u32);
-            UNIX_EPOCH + duration
+            Some(UNIX_EPOCH + duration)
         }
     }
 

src/output/table.rs

@@ -563,7 +563,7 @@ impl<'a> Table<'a> {
                 file.modified_time().render(self.theme.ui.date, &self.env.tz, self.time_format)
             }
             Column::Timestamp(TimeType::Changed)   => {
-                Some(file.changed_time()).render(self.theme.ui.date, &self.env.tz, self.time_format)
+                file.changed_time().render(self.theme.ui.date, &self.env.tz, self.time_format)
             }
             Column::Timestamp(TimeType::Created)   => {
                 file.created_time().render(self.theme.ui.date, &self.env.tz, self.time_format)