Fix optional test for ENETUNREACH error condition

Author: clue

tests/TcpConnectorTest.php

@@ -147,14 +147,7 @@ public function connectionToInvalidNetworkShouldFailWithUnreachableError()
             'Connection to ' . $address . ' failed: ' . (function_exists('socket_strerror') ? socket_strerror($enetunreach) . ' (ENETUNREACH)' : 'Network is unreachable'),
             $enetunreach
         );
-
-        try {
-            Block\await($promise, null, self::TIMEOUT);
-        } catch (\Exception $e) {
-            fclose($client);
-
-            throw $e;
-        }
+        Block\await($promise, null, self::TIMEOUT);
     }
 
     /** @test */