The ornamental design for a fixingdevice for a flashlight, as shown and described.
FIG. 1 is a perspective view of a fixing device for a flashlight showing our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a top view thereof;
FIG. 5 is a bottom view thereof;
FIG. 6 is a left side view thereof;
FIG. 7 is a right side view thereof; and,
FIG. 8 is a perspective view of the fixing device for a flashlight in alternate position in use.
The broken line showing of parts of the drawings is included for the purpose of illustrating use and environment and forms no part of the claimed design. The dash dot lines immediately adjacent to the claimed areas in the views represent the boundaries of the claimed design. None of the broken lines form any part of the claimed design.