src/queue: Fix a typo in `__io_uring_flush_sq()`
There was a typo in the comment explaining why it's ok to read `khead`
without a barrier.
@@ -230,7 +230,7 @@ out:
* This _may_ look problematic, as we're not supposed to be reading
* SQ->head without acquire semantics. When we're in SQPOLL mode, the
* kernel submitter could be updating this right now. For non-SQPOLL,
- * task itself does it, and there's no potential face. But even for
+ * task itself does it, and there's no potential race. But even for
* SQPOLL, the load is going to be potentially out-of-date the very
* instant it's done, regardless or whether or not it's done
* atomically. Worst case, we're going to be over-estimating what
