Updated async_logger flush

bench/async_bench.cpp

@@ -141,7 +141,6 @@ int main(int argc, char *argv[])
         perror("Last error");
         return 1;
     }
-
     return 0;
 }
 

include/spdlog/async_logger-inl.h

@@ -75,6 +75,13 @@ SPDLOG_INLINE void spdlog::async_logger::backend_sink_it_(const details::log_msg
 
 SPDLOG_INLINE void spdlog::async_logger::backend_flush_()
 {
-    spdlog::logger::flush_();
+    for (auto &sink : sinks_)
+    {
+        SPDLOG_TRY
+        {
+            sink->flush();
+        }
+        SPDLOG_LOGGER_CATCH()
+    }
 }