I claim the ornamental design for a digital camera, as shown and described.
FIG. 1 is a front, top and right side prospective view of a digital camera of the present invention;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a is a left side elevational view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is top plan view thereof; and,
FIG. 7 is bottom plan view thereof.
The broken line showing of digital camera is included for the purpose of illustrating environment and forms no part of the claimed design. Additionally, the dash-dot broken lines in the drawings define the bounds of the claimed design and form no part thereof.