[banshee] Mtp: Only unmount devices that are actually mounted

[Gabriel Burt <gburt src gnome org>]

commit 6e6fd8c24c6bf8e247e6f3f0fa42c0ede49af07c
Author: Gabriel Burt <gabriel burt gmail com>
Date:   Mon Mar 28 16:02:58 2011 -0500

    Mtp: Only unmount devices that are actually mounted

 .../Banshee.Dap.Mtp/Banshee.Dap.Mtp/MtpSource.cs   |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/Dap/Banshee.Dap.Mtp/Banshee.Dap.Mtp/MtpSource.cs b/src/Dap/Banshee.Dap.Mtp/Banshee.Dap.Mtp/MtpSource.cs
index 5e7294e..a256eeb 100644
--- a/src/Dap/Banshee.Dap.Mtp/Banshee.Dap.Mtp/MtpSource.cs
+++ b/src/Dap/Banshee.Dap.Mtp/Banshee.Dap.Mtp/MtpSource.cs
@@ -95,7 +95,7 @@ namespace Banshee.Dap.Mtp
                 //if (v.BusNumber == busnum && v.DeviceNumber == devnum) {
                 if (v.DeviceNumber == devnum) {
                     // If gvfs-gphoto has it mounted, unmount it
-                    if (volume != null) {
+                    if (volume != null && volume.IsMounted) {
                         volume.Unmount ();
                     }