serial: st-asc: Don't call BUG in asc_console_setup()
In order to prevent an asc instance to be used as early console, BUG_ON is used on either mapbase or membase being NULL. Problem is that this condition is also true when we set console to be a ttyASx different to the first asc instance being probed. Instead of calling BUG_ON, it now returns -ENXIO when either mapbase or membase is NULL. Signed-off-by: Maxime Coquelin <maxime.coquelin@st.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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