We claim the ornamental design for a flashlight, as shown and described.
FIG. 1 is a perspective view of a flashlight showing our new design;
FIG. 2 is a front view of FIG. 1;
FIG. 3 is a back view of FIG. 1;
FIG. 4 is a right side view of FIG. 1, the left side view being a mirror image of the right side view;
FIG. 5 is an enlarged top view of FIG. 1; and,
FIG. 6 is an enlarged bottom view of FIG. 1.
Portions of the flashlight shown in broken lines are for the purpose of showing features that form no part of the claimed design. Stippling indicates contrast in materials. Cross-hatching indicates contrast in surface texture.