Merge pull request #41010 from rzarzynski/wip-crimson-backtrace-fix-assert

crimson/common: fix broken assertion on FatalSignal setup.

Reviewed-by: Kefu Chai <kchai@redhat.com>

src/crimson/common/fatal_signal.cc

@@ -46,7 +46,7 @@ void FatalSignal::install_oneshot_signal_handler()
     sa.sa_flags |= SA_ONSTACK;
   }
   [[maybe_unused]] auto r = ::sigaction(SigNum, &sa, nullptr);
-  assert(r);
+  assert(r == 0);
 }