Make other_buffer_safely more Rust-style

rust_src/src/buffers.rs

@@ -1915,13 +1915,13 @@ pub fn other_buffer(
 // visibility of buffers, and doesn't evaluate any frame predicates.
 #[no_mangle]
 pub extern "C" fn other_buffer_safely(buffer: LispObject) -> LispObject {
- for buf in LiveBufferIter::new().map(|x| x.into()) {
- if candidate_buffer(buf, buffer) {
- return buf;
- }
+ let found = LiveBufferIter::new()
+ .map(|x| x.into())
+ .find(|buf| candidate_buffer(*buf, buffer));
+ match found {
+ Some(buf) => buf,
+ None => get_scratch_buf(),
  }
-
- get_scratch_buf()
 }
 
 include!(concat!(env!("OUT_DIR"), "/buffers_exports.rs"));