qga/win/vss: requester_freeze changes

Change requester_freeze so that the VSS backup type queried from the registry

Signed-off-by: Kfir Manor <kfir@daynix.com>
Reviewed-by: Konstantin Kostiuk <kkostiuk@redhat.com>
Signed-off-by: Konstantin Kostiuk <kkostiuk@redhat.com>

qga/vss-win32/requester.cpp

@@ -285,6 +285,7 @@ void requester_freeze(int *num_vols, void *mountpoints, ErrorSet *errset)
     DWORD wait_status;
     int num_fixed_drives = 0, i;
     int num_mount_points = 0;
+    VSS_BACKUP_TYPE vss_bt = get_vss_backup_type();
 
     if (vss_ctx.pVssbc) { /* already frozen */
         *num_vols = 0;
@@ -332,7 +333,7 @@ void requester_freeze(int *num_vols, void *mountpoints, ErrorSet *errset)
         goto out;
     }
 
-    hr = vss_ctx.pVssbc->SetBackupState(true, true, VSS_BT_FULL, false);
+    hr = vss_ctx.pVssbc->SetBackupState(true, true, vss_bt, false);
     if (FAILED(hr)) {
         err_set(errset, hr, "failed to set backup state");
         goto out;