We claim the ornamental design for an ottoman support, as shown and described.
FIG. 1 is a top front left perspective view of the ottoman support showing our new design in an environment of use;
FIG. 2 is a bottom rear left perspective view thereof;
FIG. 3 is a right side view of the ottoman support showing our new design;
FIG. 4 is a left side view thereof;
FIG. 5 is a rear view thereof;
FIG. 6 is a front view thereof;
FIG. 7 is a top view thereof; and,
FIG. 8 is a bottom view thereof.
The dash-dash lines in the figures show portions and features that form no part of the claimed design. The dash-dot line in the figures represents the unclaimed boundary of the design.