openssl: fix unused variable warnings in !verbose builds

[vszakats]

Also fix clang-tidy readability-redundant-control-flow.

lib/vtls/openssl.c:4055:46: error: unused parameter 'reason' [-Wunused-parameter]
 4055 |                                          int reason)
      |                                              ^
lib/vtls/openssl.c:4279:19: error: variable 'status' set but not used [-Wunused-but-set-variable]
 4279 |       const char *status = NULL;
      |                   ^

Ref: https://github.com/curl/curl/actions/runs/24641388439/job/72045859306?pr=21379

lib/vtls/openssl.c:4092:7: error: Value stored to 'rv' is never read [clang-analyzer-deadcode.DeadStores]
 4092 |       rv = SSL_ech_get1_status(ssl, &inner, &outer);
      |       ^    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
lib/vtls/openssl.c:4092:7: note: Value stored to 'rv' is never read
 4092 |       rv = SSL_ech_get1_status(ssl, &inner, &outer);
      |       ^    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
lib/vtls/openssl.c:4112:3: error: redundant return statement at the end of a function with a void return type [readability-redundant-control-flow]
 4111 | #endif
      | ~~~~~~
 4112 |   return;
      |   ^~~~~~~
 4113 | }

Ref: https://github.com/curl/curl/actions/runs/24642154148/job/72047919525?pr=21379#step:42:186

Cherry-picked from #21379