The ornamental design for a non-drip spout, as shown and described.
FIG. 1 is a left side enlarged elevational view of a non-drip spout, when in use, the right side enlarged elevational view being a mirror image of the side view shown;
FIG. 2 is a top and right front perspective view thereof; the top and left front perspective view being a mirror image of the perspective view shown; and,
FIG. 3 is a top, front and left side perspective view thereof, the top, front and right side perspective view being a mirror image of the perspective view shown.
The broken lines in the drawings depict environmental subject matter only and form no part of the claimed design.