Simplify row_belongs_to_score_table().

Simplify row_belongs_to_score_table().

This function was over-engineered because only one caller passed a
non-NULL rank pointer without actually using the rank for anything
other than printing it in a log message. So drop the rank parameter
and adjust the callers and the log message accordingly.

Moreover, the function returned int rather than bool to be able to
also return an error code in case the osl lookup function fails. This
should never happen though, because the only possible errors are
invalid row or table pointers, and these indicate a bug. So abort in
this case and let the function return bool.