verify-pack -v: do not report "chain length 0"

When making a histogram of delta chain length in the pack, the program
collects number of objects whose delta depth exceeds the MAX_CHAIN limit
in histogram[0], and showed it as the number of items that exceeds the
limit correctly.  HOWEVER, it also showed the same number labeled as
"chain length = 0".

In fact, we are not showing the number of objects whose chain length is
zero, i.e. the base objects.  Correct this.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin-verify-pack.c

@@ -7,10 +7,13 @@
 
 static void show_pack_info(struct packed_git *p)
 {
-	uint32_t nr_objects, i, chain_histogram[MAX_CHAIN+1];
+	uint32_t nr_objects, i;
+	int cnt;
+	unsigned long chain_histogram[MAX_CHAIN+1], baseobjects;
 
 	nr_objects = p->num_objects;
 	memset(chain_histogram, 0, sizeof(chain_histogram));
+	baseobjects = 0;
 
 	for (i = 0; i < nr_objects; i++) {
 		const unsigned char *sha1;
@@ -29,9 +32,11 @@ static void show_pack_info(struct packed_git *p)
 						 &delta_chain_length,
 						 base_sha1);
 		printf("%s ", sha1_to_hex(sha1));
-		if (!delta_chain_length)
+		if (!delta_chain_length) {
 			printf("%-6s %lu %lu %"PRIuMAX"\n",
 			       type, size, store_size, (uintmax_t)offset);
+			baseobjects++;
+		}
 		else {
 			printf("%-6s %lu %lu %"PRIuMAX" %u %s\n",
 			       type, size, store_size, (uintmax_t)offset,
@@ -43,15 +48,21 @@ static void show_pack_info(struct packed_git *p)
 		}
 	}
 
-	for (i = 0; i <= MAX_CHAIN; i++) {
-		if (!chain_histogram[i])
+	if (baseobjects)
+		printf("non delta: %lu object%s\n",
+		       baseobjects, baseobjects > 1 ? "s" : "");
+
+	for (cnt = 1; cnt <= MAX_CHAIN; cnt++) {
+		if (!chain_histogram[cnt])
 			continue;
-		printf("chain length = %"PRIu32": %"PRIu32" object%s\n", i,
-		       chain_histogram[i], chain_histogram[i] > 1 ? "s" : "");
+		printf("chain length = %d: %lu object%s\n", cnt,
+		       chain_histogram[cnt],
+		       chain_histogram[cnt] > 1 ? "s" : "");
 	}
 	if (chain_histogram[0])
-		printf("chain length > %d: %"PRIu32" object%s\n", MAX_CHAIN,
-		       chain_histogram[0], chain_histogram[0] > 1 ? "s" : "");
+		printf("chain length > %d: %lu object%s\n", MAX_CHAIN,
+		       chain_histogram[0],
+		       chain_histogram[0] > 1 ? "s" : "");
 }
 
 static int verify_one_pack(const char *path, int verbose)