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hgfs: avoid revlogupdate() calls when reading root (thanks burnzez)

we do not need to check for revlog updates on every
(directory) read when reading the root. only do it
when reading from the start.

--- a/sys/src/cmd/hgfs/fs.c

+++ b/sys/src/cmd/hgfs/fs.c

@@ -663,8 +663,10 @@

 	rf = r->fid->aux;

 	switch(rf->level){

 	case Qroot:

-		revlogupdate(&changelog);

-		revlogupdate(&manifest);

+		if(off == 0){

+			revlogupdate(&changelog);

+			revlogupdate(&manifest);

+		}

 		dirread9p(r, rootgen, nil);

 		respond(r, nil);

 		return;