The ornamental design for a camera, as shown and described.
FIG. 1 is a top, front and right side perspective view of a camera showing our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top view thereof; and,
FIG. 7 is a bottom view thereof.
The broken lines depict portions of the camera in which the design is embodied that form no part of the claimed design. The broken lines which are shown immediately adjacent to the shaded areas represent the bounds of the claimed design and form no part of the claimed design.