[banshee] Gio: bail from foreach iteration after finding null (bgo#721203)

[Andrés Aragoneses <aaragoneses src gnome org>]

commit 9d1ebf928edc793ba240603a3187f081b5d063d8
Author: Andrés G. Aragoneses <knocte gmail com>
Date:   Sun Dec 29 22:03:08 2013 +0100

    Gio: bail from foreach iteration after finding null (bgo#721203)
    
    Previous commit [1] didn't take in account that a 'yield return'
    is not equivalent to a 'return' statement with regards to loops
    (the latter will exit the loop, but not the former). So we need
    to pass to the next iteration of the loop manually via `continue`
    in every case where we want to discard creating a new Volume
    object because of finding unwanted null collaborators.
    
    https://git.gnome.org/browse/banshee/commit/?id=20bacf9a3d06b2d136b474319f0b8224947bc4b8

 .../LowLevel/RawBlockDevice.cs                     |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/src/Backends/Banshee.Gio/Banshee.Hardware.Gio/LowLevel/RawBlockDevice.cs 
b/src/Backends/Banshee.Gio/Banshee.Hardware.Gio/LowLevel/RawBlockDevice.cs
index 51cb559..73448c6 100644
--- a/src/Backends/Banshee.Gio/Banshee.Hardware.Gio/LowLevel/RawBlockDevice.cs
+++ b/src/Backends/Banshee.Gio/Banshee.Hardware.Gio/LowLevel/RawBlockDevice.cs
@@ -47,10 +47,12 @@ namespace Banshee.Hardware.Gio
                     var volume = GLib.VolumeAdapter.GetObject (notVolume as GLib.Object);
                     if (volume == null) {
                         yield return null;
+                        continue;
                     }
                     var device = Manager.GudevDeviceFromGioVolume (volume);
                     if (device == null) {
                         yield return null;
+                        continue;
                     }
                     yield return new Volume (new RawVolume (volume,
                                                             Manager,