The ornamental design for a doorjambextrusion, as shown and described.
FIG. 1 is a perspective view of a door jamb extrusion showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom view thereof.
The door jamb extrusion is shown with a symbolic break in its length. The appearance of any portion of the door jamb extrusion between the jagged break lines forms no part of the claimed design.