illumos gate

The libdladm function dladm_range2strs is using the wrong bounds check on mpr_count. Today it uses '<='; however, we're starting from zero, not 1. And in fact, when using a mac_propval_range_t consisting of uint32_t ranges, they always start at index zero. This can cause a program to dump core if it has only allocated enough memory for the function equal to the number of ranges. The fix, is simple, we just need to change the check to match the others here to use '<'.