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fixed potential bug in hjfs

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

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

@@ -482,7 +482,7 @@

 /*

  * getblk returns the address of a block in a file

  * given its relative address blk

- * the address and generation are returned in *r and *gen

+ * the address are returned in *r

  * mode has to be one of:

  * - GBREAD: this block will only be read

  * - GBWRITE: this block will be written, but don't create it

@@ -493,7 +493,6 @@

  * return value is 1 if the block existed, -1 on error

  * a return value of 0 means the block did not exist

  * this is only an error in case of GBREAD and GBWRITE

- * gen == nil allowed

  */

 int

@@ -897,8 +896,10 @@

 			continue;

 		if(rc == 0){

 			memset(c->de, 0, sizeof(c->de));

-			if(i == d->size)

+			if(i == d->size){

 				d->size++;

+				b->op |= BDELWRI;

+			}

 		}

 		for(j = 0; j < DEPERBLK; j++){

 			if(si == -1 && (c->de[j].mode & DALLOC) == 0){

-- 

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