Reduntant write bit checks

No point in checking for td_rw(td) || td_write(), since td_write()
will also be true for td_rw().

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/filesetup.c b/filesetup.c
index 6ccd357..faeefaf 100644
--- a/filesetup.c
+++ b/filesetup.c
@@ -222,7 +222,7 @@
 	if (td->o.sync_io)
 		flags |= O_SYNC;
 
-	if (td_write(td) || td_rw(td)) {
+	if (td_write(td)) {
 		flags |= O_RDWR;
 
 		if (f->filetype == FIO_TYPE_FILE)