[gnome-settings-daemon] power: Avoid warning with no batteries

[Bastien Nocera <hadess src gnome org>]

commit 647b2684334f9270894fae648de5d8e887f5ede3
Author: Bastien Nocera <hadess hadess net>
Date:   Tue Sep 17 16:06:39 2013 +0200

    power: Avoid warning with no batteries
    
    When we have no batteries, don't use an uninitialised state value.

 plugins/power/gsd-power-manager.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/plugins/power/gsd-power-manager.c b/plugins/power/gsd-power-manager.c
index e7b3cb5..deb6868 100644
--- a/plugins/power/gsd-power-manager.c
+++ b/plugins/power/gsd-power-manager.c
@@ -731,7 +731,8 @@ engine_update_composite_device (GsdPowerManager *manager)
                 battery_devices++;
         }
 
-        if (battery_devices == 0)
+        if (battery_devices == 0) {
+                state = UP_DEVICE_STATE_UNKNOWN;
                 goto out;
 
         /* use percentage weighted for each battery capacity */