[banshee] MassStorage: Ignore unmounted volumes

[Gabriel Burt <gburt src gnome org>]

commit 76a1a4275d38655aa2413e7fe4943b99916f6183
Author: Gabriel Burt <gabriel burt gmail com>
Date:   Mon Mar 28 16:10:53 2011 -0500

    MassStorage: Ignore unmounted volumes

 .../Banshee.Dap.MassStorage/MassStorageSource.cs   |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/Dap/Banshee.Dap.MassStorage/Banshee.Dap.MassStorage/MassStorageSource.cs b/src/Dap/Banshee.Dap.MassStorage/Banshee.Dap.MassStorage/MassStorageSource.cs
index b669a6b..3be5b9e 100644
--- a/src/Dap/Banshee.Dap.MassStorage/Banshee.Dap.MassStorage/MassStorageSource.cs
+++ b/src/Dap/Banshee.Dap.MassStorage/Banshee.Dap.MassStorage/MassStorageSource.cs
@@ -62,7 +62,7 @@ namespace Banshee.Dap.MassStorage
             base.DeviceInitialize (device);
 
             volume = device as IVolume;
-            if (volume == null || (usb_device = volume.ResolveRootUsbDevice ()) == null) {
+            if (volume == null || !volume.IsMounted || (usb_device = volume.ResolveRootUsbDevice ()) == null) {
                 throw new InvalidDeviceException ();
             }