block: simplify disk name formatting in check_partition

disk_name for partition 0 just copies out the disk_name field.  Replace
the call to disk_name with a %s format specifier.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20210727062518.122108-6-hch@lst.deSigned-off-by: Jens Axboe <axboe@kernel.dk>

block/partitions/core.c

@@ -136,7 +136,7 @@ static struct parsed_partitions *check_partition(struct gendisk *hd)
 	state->pp_buf[0] = '\0';
 
 	state->bdev = hd->part0;
-	disk_name(hd, 0, state->name);
+	snprintf(state->name, BDEVNAME_SIZE, "%s", hd->disk_name);
 	snprintf(state->pp_buf, PAGE_SIZE, " %s:", state->name);
 	if (isdigit(state->name[strlen(state->name)-1]))
 		sprintf(state->name, "p");