Get rid of some warnings when compiling 64bit.
diff --git a/libiptc/libiptc.c b/libiptc/libiptc.c
index 3ff7e27..b29111d 100644
--- a/libiptc/libiptc.c
+++ b/libiptc/libiptc.c
@@ -1,4 +1,4 @@
-/* Library which manipulates firewall rules.  Version $Revision: 1.45 $ */
+/* Library which manipulates firewall rules.  Version $Revision: 1.46 $ */
 
 /* Architecture of firewall rules is as follows:
  *
@@ -134,8 +134,8 @@
 
 	if (ENTRY_ITERATE(h->entries.entrytable, h->entries.size,
 			  get_number, seek, &pos) == 0) {
-		fprintf(stderr, "ERROR: offset %i not an entry!\n",
-			(char *)seek - (char *)h->entries.entrytable);
+		fprintf(stderr, "ERROR: offset %u not an entry!\n",
+			(unsigned int)((char *)seek - (char *)h->entries.entrytable));
 		abort();
 	}
 	return pos;