Enhanced P_ToXLine, P_ToXSector and P_ToXSectorOfSubsector so that they don't bother passing a NULL map object ptr to DMU only to be given one back in return.
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Enhanced P_ToXLine, P_ToXSector and P_ToXSectorOfSubsector so that they don't bother passing a NULL map object ptr to DMU only to be given one back in return.