The ornamental design for a computer, as shown and described.
FIG. 1 is a front elevation view of the computer showing my new invention;
FIG. 2 is a left side elevation view thereof;
FIG. 3 is a top plan view thereof; and,
FIG. 4 is an enlarged top front and right side perspective view thereof.
The undisclosed rear and bottom view are unornamented and the broken lines
are shown in FIGS. 2 and 3 for illustrative purposes only and claim no
part of the claimed design.