all: change f mut Foo to mut f Foo

vlib/sync/pool.v

@@ -124,7 +124,7 @@ pub fn (mut pool PoolProcessor) work_on_pointers(items []voidptr) {
 // process_in_thread does the actual work of worker thread.
 // It is a workaround for the current inability to pass a
 // method in a callback.
-fn process_in_thread(pool mut PoolProcessor, task_id int) {
+fn process_in_thread(mut pool PoolProcessor, task_id int) {
 	cb := ThreadCB(pool.thread_cb)
 	mut idx := 0
 	ilen := pool.items.len