Fix vold coredump when enable_ums cmd comes without media inserted.

Signed-off-by: Ethan.Du <a7233c@motorola.com>
Signed-off-by: David Ding <david.j.ding@motorola.com>
diff --git a/vold/volmgr.c b/vold/volmgr.c
index 3c34a9c..61d0c4f 100644
--- a/vold/volmgr.c
+++ b/vold/volmgr.c
@@ -460,7 +460,7 @@
                 pthread_mutex_lock(&v->lock);
                 if (v->state == volstate_mounted)
                     volmgr_send_eject_request(v);
-                else if (v->state == volstate_ums) {
+                else if (v->state == volstate_ums || v->state == volstate_nomedia) {
                     pthread_mutex_unlock(&v->lock);
                     goto next_vol;
                 }