Set VolumeChanged when we create a new root dir

Set the VolumeChanged flag when we create a new root directory in a
volume when salvaging, since doing so changes the volume.

Change-Id: Ic6cd0b0d6f9b52f2006a114269321a38d312ab9b
Reviewed-on: http://gerrit.openafs.org/2212
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>

src/vol/vol-salvage.c

@@ -3786,6 +3786,7 @@ SalvageVolume(register struct InodeSummary *rwIsp, IHandle_t * alinkH)
 	if (code == 0) {
 	    rootdirfound = 1;
 	    newrootdir = 1;
+	    VolumeChanged = 1;
 	}
     }