IOCTL_NFS41_DELCONN had a check for RxDeviceObject->NumberOfActiveFcbs before calling nfs41_DeleteConnection(). this prevents us from unmounting even if the netroot has no open files, and is redundant because nfs41_FinalizeNetRoot() already has the necessary check for NetRoot->NumberOfFcbs/SrvOpens
Signed-off-by: Casey Bodley <cbodley@citi.umich.edu>