block: remove bogus union

The union around bi_integrity field is pointless.
Remove it.

Signed-off-by: Kanchan Joshi <joshi.k@samsung.com>
Link: https://lore.kernel.org/r/20240917045457.429698-1-joshi.k@samsung.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Author: Kanchan Joshi

include/linux/blk_types.h

@@ -248,11 +248,9 @@ struct bio {
 	struct bio_crypt_ctx	*bi_crypt_context;
 #endif
 
-	union {
 #if defined(CONFIG_BLK_DEV_INTEGRITY)
-		struct bio_integrity_payload *bi_integrity; /* data integrity */
+	struct bio_integrity_payload *bi_integrity; /* data integrity */
 #endif
-	};
 
 	unsigned short		bi_vcnt;	/* how many bio_vec's */