lockd: update nlm_lookup_file reexport comment

Update comment to reflect that we *do* allow reexport, whether it's a
good idea or not....
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>
Signed-off-by: NChuck Lever <chuck.lever@oracle.com>

fs/lockd/svcsubs.c

@@ -111,8 +111,9 @@ nlm_lookup_file(struct svc_rqst *rqstp, struct nlm_file **result,
 	INIT_HLIST_NODE(&file->f_list);
 	INIT_LIST_HEAD(&file->f_blocks);
 
-	/* Open the file. Note that this must not sleep for too long, else
-	 * we would lock up lockd:-) So no NFS re-exports, folks.
+	/*
+	 * Open the file. Note that if we're reexporting, for example,
+	 * this could block the lockd thread for a while.
 	 *
 	 * We have to make sure we have the right credential to open
 	 * the file.