ceph: do not ignore osd_idle_ttl mount option

Actually apply the mount option to the mount_args struct.

Signed-off-by: Sage Weil <sage@newdream.net>
diff --git a/fs/ceph/super.c b/fs/ceph/super.c
index 7f751f2..9922628 100644
--- a/fs/ceph/super.c
+++ b/fs/ceph/super.c
@@ -548,6 +548,9 @@
 		case Opt_osdkeepalivetimeout:
 			args->osd_keepalive_timeout = intval;
 			break;
+		case Opt_osd_idle_ttl:
+			args->osd_idle_ttl = intval;
+			break;
 		case Opt_mount_timeout:
 			args->mount_timeout = intval;
 			break;