nfs41: translate NFS4ERR_MINOR_VERS_MISMATCH to EPROTONOSUPPORT

To be returned to the mount command when trying to mount a v4 server
using minorversion 1.

Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index 0298e90..bc683ed 100644
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -1107,6 +1107,8 @@
 			nfs4_clear_machine_cred(clp);
 			status = -EAGAIN;
 		}
+		if (status == -NFS4ERR_MINOR_VERS_MISMATCH)
+			status = -EPROTONOSUPPORT;
 	}
 	return status;
 }