Bring pre-revert code up to clippy standards

Signed-off-by: Patrick Roy <[email protected]>

src/tempfile.rs

@@ -61,10 +61,10 @@ impl TempFile {
 
         let raw_fname = CString::new(os_fname.into_vec()).unwrap().into_raw();
 
-        // Safe because I'm sure `raw_fname` is a valid CString.
+        // SAFETY: Safe because I'm sure `raw_fname` is a valid CString.
         let fd = unsafe { libc::mkstemp(raw_fname) };
 
-        // The `raw_fname` is the same as `os_fname` (which is `prefix` with X's
+        // SAFETY: The `raw_fname` is the same as `os_fname` (which is `prefix` with X's
         // appended). The X's are documented as "six characters" which seem to
         // always be alphanumerics so appears safe.
         let c_tempname = unsafe { CString::from_raw(raw_fname) };
@@ -74,7 +74,7 @@ impl TempFile {
             return errno_result();
         }
 
-        // Safe because we checked `fd != -1` above and we uniquely own the file
+        // SAFETY: Safe because we checked `fd != -1` above and we uniquely own the file
         // descriptor. This `fd` will be freed etc when `File` and thus
         // `TempFile` goes out of scope.
         let file = unsafe { File::from_raw_fd(fd) };