xcalloc: use CALLOC_ARRAY() when applicable

These are for codebase before Git 2.31

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

builtin/receive-pack.c

@@ -1837,11 +1837,9 @@ static void prepare_shallow_update(struct shallow_info *si)
 	ALLOC_ARRAY(si->used_shallow, si->shallow->nr);
 	assign_shallow_commits_to_refs(si, si->used_shallow, NULL);
 
-	si->need_reachability_test =
-		xcalloc(si->shallow->nr, sizeof(*si->need_reachability_test));
-	si->reachable =
-		xcalloc(si->shallow->nr, sizeof(*si->reachable));
-	si->shallow_ref = xcalloc(si->ref->nr, sizeof(*si->shallow_ref));
+	CALLOC_ARRAY(si->need_reachability_test, si->shallow->nr);
+	CALLOC_ARRAY(si->reachable, si->shallow->nr);
+	CALLOC_ARRAY(si->shallow_ref, si->ref->nr);
 
 	for (i = 0; i < si->nr_ours; i++)
 		si->need_reachability_test[si->ours[i]] = 1;

t/helper/test-bloom.c

@@ -65,7 +65,7 @@ int cmd__bloom(int argc, const char **argv)
 		struct bloom_filter filter;
 		int i = 2;
 		filter.len =  (settings.bits_per_entry + BITS_PER_WORD - 1) / BITS_PER_WORD;
-		filter.data = xcalloc(filter.len, sizeof(unsigned char));
+		CALLOC_ARRAY(filter.data, filter.len);
 
 		if (argc - 1 < i)
 			usage(bloom_usage);