I claim the ornamental design for a grill for automobile, as shown and described.
FIG. 1 is a front perspective view of a grill for automobile according to my new design; and,
FIG. 2 is a front plan view of the grill for automobile shown in FIG. 1.
The ornamental design which is claimed is shown in solid lines in the drawings. Any broken lines in the drawings are for illustrative purposes only and form no part of the claimed design.