The ornamental design for a door facing, as shown and described.
FIG. 1 is a front perspective view of our design;
FIG. 2 is a front elevational view;
FIG. 3 is a front perspective view of a variant of FIG. 1;
FIG. 4 is a front elevational view of FIG. 3; and,
FIG. 5 is a fragmentary cross-sectional view taken along the line 5-5 of FIGS. 2 and 4.
The broken lines in the drawings depict environment that forms no part of the claimed design. The underlying surfaces do not form part of the claimed design.