RE: [PATCH 1/9] coding-style: add rule about checking NULL pointer

+M13: Check for pointer being NULL +================================= + +When checking if a pointer or a return value is NULL, explicitly +compare to NULL rather than use the shorter check with "!" operator. + +Example: +1) +array = g_try_new0(int, 20); +if (!array) // Wrong + return; + +2) +if (!g_at_chat_get_slave(chat)) // Wrong + return -EINVAL; + +3) +array = g_try_new0(int, 20); +if (!array) // Correct