nfsd: remove set but not used variable 'dirp'

Fixes gcc '-Wunused-but-set-variable' warning:

fs/nfsd/vfs.c: In function 'nfsd_create':
fs/nfsd/vfs.c:1279:16: warning:
 variable 'dirp' set but not used [-Wunused-but-set-variable]
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

fs/nfsd/vfs.c

@@ -1275,7 +1275,6 @@ nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
 		int type, dev_t rdev, struct svc_fh *resfhp)
 {
 	struct dentry	*dentry, *dchild = NULL;
-	struct inode	*dirp;
 	__be32		err;
 	int		host_err;
 
@@ -1287,7 +1286,6 @@ nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
 		return err;
 
 	dentry = fhp->fh_dentry;
-	dirp = d_inode(dentry);
 
 	host_err = fh_want_write(fhp);
 	if (host_err)