lib.ctable: fix hugepages allocation size
lib.ctable: fix hugepages allocation size

mmap() silently rounds up the size of the memory region to a multiple
of the huge page size.  This causes munmap() to fail if called with
the original value.

eugeneia/snabb,snabbco/snabb,eugeneia/snabb,SnabbCo/snabbswitch,snabbco/snabb,snabbco/snabb,snabbco/snabb,eugeneia/snabb,Igalia/snabb,Igalia/snabb,snabbco/snabb,SnabbCo/snabbswitch,snabbco/snabb,SnabbCo/snabbswitch,Igalia/snabb,Igalia/snabb,eugeneia/snabb,Igalia/snabb,snabbco/snabb,SnabbCo/snabbswitch,eugeneia/snabb,eugeneia/snabb,Igalia/snabb,eugeneia/snabb,snabbco/snabb,Igalia/snabb,eugeneia/snabb,Igalia/snabb