JFS: Fix bug in quota code. tmp_bh.b_size must be initialized

Signed-off-by: NDave Kleikamp <shaggy@austin.ibm.com>

fs/jfs/super.c

@@ -678,6 +678,7 @@ static ssize_t jfs_quota_write(struct super_block *sb, int type,
 				sb->s_blocksize - offset : towrite;
 
 		tmp_bh.b_state = 0;
+		tmp_bh.b_size = 1 << inode->i_blkbits;
 		err = jfs_get_block(inode, blk, &tmp_bh, 1);
 		if (err)
 			goto out;