The ornamental design for a device mount, as shown and described.
FIG. 1 is a front perspective view of a device mount according to our new design;
FIG. 2 is a front elevation view of the device mount of FIG. 1;
FIG. 3 is a rear elevation view of the device mount of FIG. 1;
FIG. 4 is a left-side elevation view of the device mount of FIG. 1;
FIG. 5 is a right-side elevation view of the device mount of FIG. 1;
FIG. 6 is a top plan view of the device mount of FIG. 1; and,
FIG. 7 is a bottom plan view of the device mount of FIG. 1.
The broken lines immediately adjacent the shaded areas depict the bounds of the claimed design while all other broken lines are directed to environment; the broken lines form no part of the claimed design.