io_uring: remove unused argument 'tsk' from io_req_caches_free()

We prune the full cache regardless, get rid of the dead argument.
Signed-off-by: Jens Axboe <axboe@kernel.dk>

fs/io_uring.c

@@ -8395,7 +8395,7 @@ static void io_req_cache_free(struct list_head *list, struct task_struct *tsk)
 	}
 }
 
-static void io_req_caches_free(struct io_ring_ctx *ctx, struct task_struct *tsk)
+static void io_req_caches_free(struct io_ring_ctx *ctx)
 {
 	struct io_submit_state *submit_state = &ctx->submit_state;
 	struct io_comp_state *cs = &ctx->submit_state.comp;
@@ -8455,7 +8455,7 @@ static void io_ring_ctx_free(struct io_ring_ctx *ctx)
 
 	percpu_ref_exit(&ctx->refs);
 	free_uid(ctx->user);
-	io_req_caches_free(ctx, NULL);
+	io_req_caches_free(ctx);
 	if (ctx->hash_map)
 		io_wq_put_hash(ctx->hash_map);
 	kfree(ctx->cancel_hash);
@@ -8969,7 +8969,7 @@ static int io_uring_flush(struct file *file, void *data)
 
 	if (fatal_signal_pending(current) || (current->flags & PF_EXITING)) {
 		io_uring_cancel_task_requests(ctx, NULL);
-		io_req_caches_free(ctx, current);
+		io_req_caches_free(ctx);
 	}
 
 	io_run_ctx_fallback(ctx);