[PATCH tor v1 2/6] connection_or: Fix clang-15 complaint (unused variable)

[Ammar Faizi <ammarfaizi2@gnuweeb.org>]

clang-15 throws the following complaints:

```
  src/core/or/connection_or.c:1075:7: error: variable 'n_old' set but not used [-Werror,-Wunused-but-set-variable]
    int n_old = 0, n_inprogress = 0, n_canonical = 0, n_other = 0;
        ^
  src/core/or/connection_or.c:1075:53: error: variable 'n_other' set but not used [-Werror,-Wunused-but-set-variable]
    int n_old = 0, n_inprogress = 0, n_canonical = 0, n_other = 0;
                                                      ^
  src/core/or/connection_or.c:1075:18: error: variable 'n_inprogress' set but not used [-Werror,-Wunused-but-set-variable]
    int n_old = 0, n_inprogress = 0, n_canonical = 0, n_other = 0;
                   ^
```

These variables firstly introduced in commit df608fef4522 ("Checkpoint
my big bug-891 patch."). Now they are no longer used. But I personally
think these variables may still be useful for counting purpose someday.
As such add `(void)` cast to them to suppress the clang complaints.

Cc: Nick Mathewson <nickm@torproject.org>
Signed-off-by: Ammar Faizi <ammarfaizi2@gnuweeb.org>
---
 src/core/or/connection_or.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/core/or/connection_or.c b/src/core/or/connection_or.c
index 0018b1dfd8..5a387b54fe 100644
--- a/src/core/or/connection_or.c
+++ b/src/core/or/connection_or.c
@@ -1075,6 +1075,10 @@ connection_or_group_set_badness_(smartlist_t *group, int force)
   int n_old = 0, n_inprogress = 0, n_canonical = 0, n_other = 0;
   time_t now = time(NULL);
 
+  (void)n_old;
+  (void)n_inprogress;
+  (void)n_other;
+
   /* Pass 1: expire everything that's old, and see what the status of
    * everything else is. */
   SMARTLIST_FOREACH_BEGIN(group, or_connection_t *, or_conn) {
-- 
Ammar Faizi