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This unref is guaranteed to be freeing a NULL pointer. Tested manually: use dbus-send to send an invalid debug level parameter Before change: $ dbus-send --system --dest=fi.w1.wpa_supplicant1 --print-reply /fi/w1/wpa_supplicant1 org.freedesktop.DBus.Properties.Set string:fi.w1.wpa_supplicant1 string:DebugLevel variant:string:msgdumpf Error org.freedesktop.DBus.Error.NoReply: Message did not receive a reply (timeout by message bus) (and then wpa_supplicant crashes) After change: $ dbus-send --system --dest=fi.w1.wpa_supplicant1 --print-reply /fi/w1/wpa_supplicant1 org.freedesktop.DBus.Properties.Set string:fi.w1.wpa_supplicant1 string:DebugLevel variant:string:msgdumpf Error fi.w1.wpa_supplicant1.InvalidArgs: Did not receive correct message arguments. Signed-off-by: Paul Stewart <pstew@google.com>