server-info: remove unused members from struct pack_info

The head member of struct pack_info is completely unused and the
nr_heads member is used only in one place, which is an assignment.  This
member was last usefully used in 3e15c67c (server-info: throw away T
computation as well, 2005-12-04).

Since this structure member is not useful, remove it.
Signed-off-by: Nbrian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

server-info.c

@@ -92,8 +92,6 @@ static struct pack_info {
 	int old_num;
 	int new_num;
 	int nr_alloc;
-	int nr_heads;
-	unsigned char (*head)[20];
 } **info;
 static int num_pack;
 static const char *objdir;
@@ -225,12 +223,9 @@ static void init_pack_info(const char *infofile, int force)
 	else
 		stale = 1;
 
-	for (i = 0; i < num_pack; i++) {
-		if (stale) {
+	for (i = 0; i < num_pack; i++)
+		if (stale)
 			info[i]->old_num = -1;
-			info[i]->nr_heads = 0;
-		}
-	}
 
 	/* renumber them */
 	QSORT(info, num_pack, compare_info);