The ornamental design for a camera, as shown and described.
FIG. 1 is a top, front and left side perspective view of a camera embodying the new design;
FIG. 2 is a bottom, rear and right side perspective view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a left side view thereof;
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a bottom plan view thereof.
The broken lines depict portions of the camera that form no part of the claimed design. Additionally, the dot-dash broken lines denote the boundary of the claim and form no part of the claimed design.