tests: Fix memory leak in ssh_server_fuzzer

Signed-off-by: Andreas Schneider <asn@cryptomilk.org>
Reviewed-by: Jakub Jelen <jjelen@redhat.com>

tests/fuzz/ssh_server_fuzzer.cpp

@@ -186,6 +186,8 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
         }
     }
 
+    ssh_event_free(event);
+
     close(socket_fds[0]);
     close(socket_fds[1]);