0a7492c man: correct return value of sd_bus_open_with_description

1 file Authored by bluca 2 years ago, Committed by zbyszek 2 years ago,
    man: correct return value of sd_bus_open_with_description
    
    Since https://github.com/systemd/systemd/commit/f4b2933ee7890e5d414ab266d8586f19027a2bd9
    if a description is not set, sd_bus_open_with_description returns -ENXIO, but the
    documnetation stated that it returned successfully with a NULL string.
    
    (cherry picked from commit 48e5ef14af5ade97b0f7491c63443778c7602c43)