Make the Windows leak detection more robust

This change:

* Increases MY_ROW_LIMIT to 2M, since it has been failing in #5595's
  tests since it's _super_ close to the limit.
* Calls `git_repository_free()` on a `git_repository` that was being
  leaked only in Windows.
* Marks the global `git_repository` on `tests/repo/init.c` as `NULL`
  after being freed to make any accidental access more noisy.
* Uses `cl_assert_equal_i()` in `test_trace_windows_stacktrace__leaks`
  to make the test failures more actionable.
* Renames the globals in `tests/repo/init.c` so that they don't start
  with an underscore.

src/win32/w32_crtdbg_stacktrace.c

@@ -57,7 +57,7 @@ static CRITICAL_SECTION g_crtdbg_stacktrace_cs;
  * it and try again.
  */
 
-#define MY_ROW_LIMIT (1024 * 1024)
+#define MY_ROW_LIMIT (2 * 1024 * 1024)
 static git_win32__crtdbg_stacktrace__row  g_cs_rows[MY_ROW_LIMIT];
 static git_win32__crtdbg_stacktrace__row *g_cs_index[MY_ROW_LIMIT];
 

tests/trace/windows/stacktrace.c

@@ -58,47 +58,48 @@ void test_trace_windows_stacktrace__leaks(void)
 		GIT_WIN32__CRTDBG_STACKTRACE__QUIET |
 		GIT_WIN32__CRTDBG_STACKTRACE__LEAKS_SINCE_MARK,
 		"p1");
-	cl_assert((leaks == 1));
+	cl_assert_equal_i(1, leaks);
 
 	p2 = git__malloc(5);
 	leaks = git_win32__crtdbg_stacktrace__dump(
 		GIT_WIN32__CRTDBG_STACKTRACE__QUIET |
 		GIT_WIN32__CRTDBG_STACKTRACE__LEAKS_SINCE_MARK,
 		"p1,p2");
-	cl_assert((leaks == 2));
+	cl_assert_equal_i(2, leaks);
 
 	p3 = git__malloc(5);
 	leaks = git_win32__crtdbg_stacktrace__dump(
 		GIT_WIN32__CRTDBG_STACKTRACE__QUIET |
 		GIT_WIN32__CRTDBG_STACKTRACE__LEAKS_SINCE_MARK,
 		"p1,p2,p3");
-	cl_assert((leaks == 3));
+	cl_assert_equal_i(3, leaks);
 
 	git__free(p2);
 	leaks = git_win32__crtdbg_stacktrace__dump(
 		GIT_WIN32__CRTDBG_STACKTRACE__QUIET |
 		GIT_WIN32__CRTDBG_STACKTRACE__LEAKS_SINCE_MARK,
 		"p1,p3");
-	cl_assert((leaks == 2));
+	cl_assert_equal_i(2, leaks);
 
 	/* move the mark. only new leaks should appear afterwards */
 	error = git_win32__crtdbg_stacktrace__dump(
 		GIT_WIN32__CRTDBG_STACKTRACE__SET_MARK,
 		NULL);
-	cl_assert((error == 0));
+	/* cannot use cl_git_pass() since that may allocate memory. */
+	cl_assert_equal_i(0, error);
 
 	leaks = git_win32__crtdbg_stacktrace__dump(
 		GIT_WIN32__CRTDBG_STACKTRACE__QUIET |
 		GIT_WIN32__CRTDBG_STACKTRACE__LEAKS_SINCE_MARK,
 		"not_p1,not_p3");
-	cl_assert((leaks == 0));
+	cl_assert_equal_i(0, leaks);
 
 	p4 = git__malloc(5);
 	leaks = git_win32__crtdbg_stacktrace__dump(
 		GIT_WIN32__CRTDBG_STACKTRACE__QUIET |
 		GIT_WIN32__CRTDBG_STACKTRACE__LEAKS_SINCE_MARK,
 		"p4,not_p1,not_p3");
-	cl_assert((leaks == 1));
+	cl_assert_equal_i(1, leaks);
 
 	git__free(p1);
 	git__free(p3);
@@ -106,21 +107,21 @@ void test_trace_windows_stacktrace__leaks(void)
 		GIT_WIN32__CRTDBG_STACKTRACE__QUIET |
 		GIT_WIN32__CRTDBG_STACKTRACE__LEAKS_SINCE_MARK,
 		"p4");
-	cl_assert((leaks == 1));
+	cl_assert_equal_i(1, leaks);
 
 	git__free(p4);
 	leaks = git_win32__crtdbg_stacktrace__dump(
 		GIT_WIN32__CRTDBG_STACKTRACE__QUIET |
 		GIT_WIN32__CRTDBG_STACKTRACE__LEAKS_SINCE_MARK,
 		"end");
-	cl_assert((leaks == 0));
+	cl_assert_equal_i(0, leaks);
 
 	/* confirm current absolute leaks count matches beginning value. */
 	after = git_win32__crtdbg_stacktrace__dump(
 		GIT_WIN32__CRTDBG_STACKTRACE__QUIET |
 		GIT_WIN32__CRTDBG_STACKTRACE__LEAKS_TOTAL,
 		"total");
-	cl_assert((before == after));
+	cl_assert_equal_i(before, after);
 #endif
 }