[PATCH tor v1 4/6] compat_libevent: Fix clang-15 complaint (unused variable)

[Ammar Faizi <ammarfaizi2@gnuweeb.org>]

clang-15 throws the following complaint:

```
  src/lib/evloop/compat_libevent.c:140:9: error: variable 'attempts' set but not used [-Werror,-Wunused-but-set-variable]
      int attempts = 0;
          ^
  1 error generated.
```

This variable firstly introduced in commit 7be50c26e8b2 ("Disable IOCP
and retry event_base_new_with_config once on failure"). It's not used.
Remove it.

Cc: Nick Mathewson <nickm@torproject.org>
Signed-off-by: Ammar Faizi <ammarfaizi2@gnuweeb.org>
---
 src/lib/evloop/compat_libevent.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/src/lib/evloop/compat_libevent.c b/src/lib/evloop/compat_libevent.c
index fd840f8085..c882d3478e 100644
--- a/src/lib/evloop/compat_libevent.c
+++ b/src/lib/evloop/compat_libevent.c
@@ -137,10 +137,8 @@ tor_libevent_initialize(tor_libevent_cfg_t *torcfg)
   (void)torcfg;
 
   {
-    int attempts = 0;
     struct event_config *cfg;
 
-    ++attempts;
     cfg = event_config_new();
     tor_assert(cfg);
 
-- 
Ammar Faizi