The ornamental design for log holder, as shown and described.
The single FIGURE is a perspective view of a log holder, showing my new
design.
The side and end of the log holder which are not shown are identical to the
side and end which are shown. The bottom surface of the log holder is
substantially planar and unornamented. The mesh-like pattern is understood
to repeat uniformly and continuously across the entire surface of the log
holder.