Clean up GIT_UNUSED macros on all platforms

It turns out that commit 31e9cfc4cbcaf1b38cdd3dbe3282a8f57e5366a5
did not fix the GIT_USUSED behavior on all platforms.  This commit
walks through and really cleans things up more thoroughly, getting
rid of the unnecessary stuff.

To remove the use of some GIT_UNUSED, I ended up adding a couple
of new iterators for hashtables that allow you to iterator just
over keys or just over values.

In making this change, I found a bug in the clar tests (where we
were doing *count++ but meant to do (*count)++ to increment the
value).  I fixed that but then found the test failing because it
was not really using an empty repo.  So, I took some of the code
that I wrote for iterator testing and moved it to clar_helpers.c,
then made use of that to make it easier to open fixtures on a
per test basis even within a single test file.

1 files changed, 2 insertions, 7 deletions

diff --git a/tests-clar/diff/blob.c b/tests-clar/diff/blob.c
index 7aa8ceb2..bdfe8baa 100644
--- a/tests-clar/diff/blob.c
+++ b/tests-clar/diff/blob.c
@@ -5,17 +5,12 @@ static git_repository *g_repo = NULL;
 
 void test_diff_blob__initialize(void)
 {
-	cl_fixture_sandbox("attr");
-	cl_git_pass(p_rename("attr/.gitted", "attr/.git"));
-	cl_git_pass(p_rename("attr/gitattributes", "attr/.gitattributes"));
-	cl_git_pass(git_repository_open(&g_repo, "attr/.git"));
+	g_repo = cl_git_sandbox_init("attr");
 }
 
 void test_diff_blob__cleanup(void)
 {
-	git_repository_free(g_repo);
-	g_repo = NULL;
-	cl_fixture_cleanup("attr");
+	cl_git_sandbox_cleanup();
 }
 
 void test_diff_blob__0(void)