xfrm: fix naming consistency in xfrmnl_sp_get_curlifetime()
xfrm: fix naming consistency in xfrmnl_sp_get_curlifetime()

Trivial name change for consistency.

https://github.com/thom311/libnl/pull/276

greearb/libnl-ct,thom311/libnl,thom311/libnl,greearb/libnl-ct,greearb/libnl-ct,thom311/libnl