log.c typo

@sueloverso, I think this is a typo, but wanted you to check me.

The reason I was looking at this code was the rework from uint32_t to size_t -- basically rdup_len and reclen are declared uint32_t's, but should probably be size_t?  I looked around but couldn't convince myself that size_t was that much better, so I left it alone, but we are calling functions that now take size_t with uint32_t args.