64-bit compile warnings

Just some ptr -> int error casts, nothing critical.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/fio.c b/fio.c
index 95e06dd..3191a7d 100644
--- a/fio.c
+++ b/fio.c
@@ -769,7 +769,7 @@
 	close_ioengine(td);
 	cleanup_io_u(td);
 	td_set_runstate(td, TD_EXITED);
-	return (void *) td->error;
+	return (void *) (unsigned long) td->error;
 }
 
 /*
@@ -792,7 +792,7 @@
 	td = data + offset * sizeof(struct thread_data);
 	ret = thread_main(td);
 	shmdt(data);
-	return (int) ret;
+	return (int) (unsigned long) ret;
 }
 
 /*