NFSD: Avoid calling fh_drop_write() twice in do_nfsd_create()

Clean up: The "out" label already invokes fh_drop_write().

Note that fh_drop_write() is already careful not to invoke
mnt_drop_write() if either it has already been done or there is
nothing to drop. Therefore no change in behavior is expected.
Signed-off-by: NChuck Lever <chuck.lever@oracle.com>

fs/nfsd/vfs.c

@@ -1479,7 +1479,6 @@ do_nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
 		case NFS3_CREATE_GUARDED:
 			err = nfserr_exist;
 		}
-		fh_drop_write(fhp);
 		goto out;
 	}
 
@@ -1487,10 +1486,8 @@ do_nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
 		iap->ia_mode &= ~current_umask();
 
 	host_err = vfs_create(&init_user_ns, dirp, dchild, iap->ia_mode, true);
-	if (host_err < 0) {
-		fh_drop_write(fhp);
+	if (host_err < 0)
 		goto out_nfserr;
-	}
 	if (created)
 		*created = true;