The ornamental design for a gutterleafguard, as shown and described.
FIG. 1 is a perspective view of the gutter leaf guard;
FIG. 2 is a top view thereof;
FIG. 3 is a first side end view thereof the opposed end being a mirror image of FIG. 3;
FIG. 4 is a front plan view thereof;
FIG. 5 is a bottom view thereof; and,
FIG. 6 is a rear plan view thereof.
The dashed circular elements represent holes in the gutter leaf guard but form no part of the claimed invention. FIGS. 1, 2, 4, 5 and 6 are shown with a symbolic break in the gutter leaf guard length. Any portion of the article between the break forms no part of the claim.