Merge #18013: bench: Fix benchmarks filters

0dae5a5 Fix benchmarks filters (Elichai Turkel)

Pull request description:

  The bug was introduced in bitcoin/bitcoin#17781
  before this fix `./src/bench/bench_bitcoin -filter=*` will fail with:

  ```
  # Benchmark, evals, iterations, total, min, max, median
  bench_bitcoin: bench/bench.cpp:119: static void benchmark::BenchRunner::RunAll(benchmark::Printer&, uint64_t, double, const string&, bool): Assertion `g_testing_setup == nullptr' failed.
  Aborted (core dumped)
  ```

ACKs for top commit:
  MarcoFalke:
    ACK 0dae5a5

Tree-SHA512: 43de4c7f4a5f29593972cf3bc822429466d0609c159c95d37c9e5370be392ace698b218a65542c7d53bfa52db7377ebdab808501ae109c2249f7f956bd318312

Author: MarcoFalke

src/bench/bench.cpp

@@ -126,6 +126,7 @@ void benchmark::BenchRunner::RunAll(Printer& printer, uint64_t num_evals, double
         }
 
         if (!std::regex_match(p.first, baseMatch, reFilter)) {
+             g_testing_setup = nullptr;
             continue;
         }