[Windows] Mark old_report_mode as unused

When compiling in release mode the _CrtSetReportMode macro
gets replaced by void(0). This makes old_report_mode unused.
Silence a warning about it.

1 files changed, 3 insertions, 2 deletions

diff --git a/crypto/compat/posix_win.c b/crypto/compat/posix_win.c
index 3e78a07..bb3e653 100644
--- a/crypto/compat/posix_win.c
+++ b/crypto/compat/posix_win.c
@@ -164,9 +164,10 @@ static void noop_handler(const wchar_t *expression,	const wchar_t *function,
 }
 
 #define BEGIN_SUPPRESS_IPH \
-        int old_report_mode = _CrtSetReportMode(_CRT_ASSERT, 0); \
-        _invalid_parameter_handler old_handler = _set_thread_local_invalid_parameter_handler(noop_handler)
+        const int old_report_mode = _CrtSetReportMode(_CRT_ASSERT, 0); \
+        const _invalid_parameter_handler old_handler = _set_thread_local_invalid_parameter_handler(noop_handler)
 #define END_SUPPRESS_IPH \
+        (void)old_report_mode; /* Silence warning in release mode when _CrtSetReportMode compiles to void. */ \
         _CrtSetReportMode(_CRT_ASSERT, old_report_mode); \
         _set_thread_local_invalid_parameter_handler(old_handler)