nfsd: remove unneeded forward declaration of nfsd4_mark_cb_fault()

This isn't needed.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

Author: jtlayton

fs/nfsd/nfs4callback.c

@@ -46,8 +46,6 @@
 
 #define NFSDDBG_FACILITY                NFSDDBG_PROC
 
-static void nfsd4_mark_cb_fault(struct nfs4_client *clp);
-
 #define NFSPROC4_CB_NULL 0
 #define NFSPROC4_CB_COMPOUND 1