oid_array: use size_t for iteration

The previous commit started using size_t for our allocations. There are
some iterations that use int or unsigned, though. These aren't dangerous
with respect to memory, but they could produce incorrect results.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

sha1-array.c

@@ -46,7 +46,7 @@ int oid_array_for_each(struct oid_array *array,
 		       for_each_oid_fn fn,
 		       void *data)
 {
-	int i;
+	size_t i;
 
 	/* No oid_array_sort() here! See sha1-array.h */
 
@@ -62,7 +62,7 @@ int oid_array_for_each_unique(struct oid_array *array,
 			      for_each_oid_fn fn,
 			      void *data)
 {
-	int i;
+	size_t i;
 
 	if (!array->sorted)
 		oid_array_sort(array);
@@ -82,7 +82,7 @@ void oid_array_filter(struct oid_array *array,
 		      for_each_oid_fn want,
 		      void *cb_data)
 {
-	unsigned nr = array->nr, src, dst;
+	size_t nr = array->nr, src, dst;
 	struct object_id *oids = array->oid;
 
 	for (src = dst = 0; src < nr; src++) {