bcachefs: Fix erorr path in bch2_write()

The error path in bch2_write wasn't updated when the end_io callback was
added to bch_write_op.
Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

fs/bcachefs/io.c

@@ -1176,7 +1176,12 @@ void bch2_write(struct closure *cl)
 err:
 	if (!(op->flags & BCH_WRITE_NOPUT_RESERVATION))
 		bch2_disk_reservation_put(c, &op->res);
-	closure_return(cl);
+	if (op->end_io)
+		op->end_io(op);
+	if (cl->parent)
+		closure_return(cl);
+	else
+		closure_debug_destroy(cl);
 }
 
 /* Cache promotion on read */