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hjfs: Add comment to change the OFF size to 8 when given the chance

--- a/sys/src/cmd/hjfs/dat.h

+++ b/sys/src/cmd/hjfs/dat.h

@@ -79,6 +79,11 @@

 enum {

 	DENTRYSIZ = NAMELEN + 4 * sizeof(ushort) + 13 + (3 + NDIRECT + NINDIRECT) * sizeof(uvlong),

 	DEPERBLK = RBLOCK / DENTRYSIZ,

+	/* Given any opportunity to make a breaking change to hjfs,

+	 * make this 12 an 8. Indirect offsets to blocks used to

+	 * hold an incrementing  4 byte generation number. That

+	 * design has changed.

+	 */

 	OFFPERBLK = RBLOCK / 12,

 	REFSIZ = 3,

 	REFPERBLK = RBLOCK / REFSIZ,

@@ -185,8 +190,8 @@

 	CHREAD = 1,

 	CHWRITE = 2,

 	CHRCLOSE = 4,

-	CHFDUMP = 1,

+	CHFDUMP = 1,

 	CHFNOLOCK = 2,

 	CHFRO = 4,

 	CHFNOPERM = 8,

--- a/sys/src/cmd/hjfs/fs1.c

+++ b/sys/src/cmd/hjfs/fs1.c

@@ -449,7 +449,7 @@

 		if((l->flags & LGONE) != 0){

 			/*

 			 * safe to unlock here, the file is gone and

-			 * we'r the last reference.

+			 * we're the last reference.

 			 */

 			qunlock(&fs->loctree);

 			b = getbuf(fs->d, l->blk, TDENTRY, 0);

--- a/sys/src/cmd/hjfs/fs2.c

+++ b/sys/src/cmd/hjfs/fs2.c

@@ -100,7 +100,6 @@

 	return p - name < NAMELEN;

 }

-

 int

 chancreat(Chan *ch, char *name, int perm, int mode)

 {