block/bio-integrity: don't free 'buf' if bio_integrity_add_page() failed

commit e7bf90e ("block/bio-integrity: fix a memory leak bug") added
a kfree() for 'buf' if bio_integrity_add_page() returns '0'. However,
the object will be freed in bio_integrity_free() since 'bio->bi_opf' and
'bio->bi_integrity' were set previousy in bio_integrity_alloc().

Fixes: commit e7bf90e ("block/bio-integrity: fix a memory leak bug")
Signed-off-by: yu kuai <[email protected]>
Reviewed-by: Ming Lei <[email protected]>
Reviewed-by: Bob Liu <[email protected]>
Acked-by: Martin K. Petersen <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>

Author: YuKuai-huawei

block/bio-integrity.c

@@ -281,7 +281,6 @@ bool bio_integrity_prep(struct bio *bio)
 
 		if (ret == 0) {
 			printk(KERN_ERR "could not attach integrity payload\n");
-			kfree(buf);
 			status = BLK_STS_RESOURCE;
 			goto err_end_io;
 		}