ext2fsd: fix Ext2Mgr hang at startup

ext2fsd: Fix Ext2Mgr hang at startup.
Partial revert of git commits d8632a1 and d570f95

 Ext3Fsd/memory.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/Ext3Fsd/memory.c b/Ext3Fsd/memory.c
index f8f333e..68d5edb 100644
--- a/Ext3Fsd/memory.c
+++ b/Ext3Fsd/memory.c
@@ -2428,7 +2428,15 @@ Ext2InitializeVcb( IN PEXT2_IRP_CONTEXT IrpContext,
         /* initialize UUID and serial number */
         if (Ext2IsNullUuid(sb->s_uuid)) {
             ExUuidCreate((UUID *)sb->s_uuid);
+        } else {
+            /* query parameters from registry */
+            if (!NT_SUCCESS(Ext2PerformRegistryVolumeParams(Vcb))) {
+                /* don't mount this volume */
+                Status = STATUS_UNRECOGNIZED_VOLUME;
+                __leave;
+            }
         }
+
         Vpb->SerialNumber = ((ULONG*)sb->s_uuid)[0] +
                             ((ULONG*)sb->s_uuid)[1] +
                             ((ULONG*)sb->s_uuid)[2] +
@@ -2713,10 +2721,6 @@ Ext2InitializeVcb( IN PEXT2_IRP_CONTEXT IrpContext,

         /* get anything doen, then refer target device */
         ObReferenceObject(Vcb->TargetDeviceObject);
-
-        /* query parameters from registry */
-        Ext2PerformRegistryVolumeParams(Vcb);
-
         SetLongFlag(Vcb->Flags, VCB_INITIALIZED);

     } __finally {