partitions: warn about the partition exceeding device capacity

The current warning message says only about the kernel's action taken
without mentioning the underlying reason behind it.
Noticed-by: Robert Hancock <hancockrwd@gmail.com>
Cc: Frans Pop <elendil@planet.nl>
Cc: "Andries E. Brouwer" <Andries.Brouwer@cwi.nl>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Emphatically-Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

fs/partitions/check.c

@@ -564,7 +564,8 @@ int rescan_partitions(struct gendisk *disk, struct block_device *bdev)
 			 * creating invalid block devices
 			 */
 			printk(KERN_WARNING
-			       "%s: p%d size %llu limited to end of disk\n",
+			       "%s: p%d size %llu exceeds device capacity, "
+			       "limited to end of disk\n",
 			       disk->disk_name, p, (unsigned long long) size);
 			size = get_capacity(disk) - from;
 		}