pNFS: pnfs_layoutcommit_outstanding() is no longer used when !CONFIG_NFS_V4_1

Cleanup...
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>

fs/nfs/pnfs.h

@@ -716,13 +716,6 @@ pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
 	return false;
 }
 
-static inline bool
-pnfs_layoutcommit_outstanding(struct inode *inode)
-{
-	return false;
-}
-
-
 static inline struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
 {
 	return NULL;