Suppress warning on 64-bit big-endian computers (Sparc 64).

xlate64 produces unsigned long long type, but PRIu64 is defined
to accept argument unsigned long type (on 64-bit machines).

On existing machines, both types have the same size, so it works,
but it is still wrong and produces a warning.

Fix it by using a cast to uint64_t --- according to the standard,
PRIu64 argument matches type uint64_t.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>

lib/label/label.c

@@ -138,7 +138,7 @@ static struct labeller *_find_labeller(struct device *dev, char *buf,
 				log_info("%s: Label for sector %" PRIu64
 					 " found at sector %" PRIu64
 					 " - ignoring", dev_name(dev),
-					 xlate64(lh->sector_xl),
+					 (uint64_t)xlate64(lh->sector_xl),
 					 sector + scan_sector);
 				continue;
 			}