statsd: Fix compiler warning (int32_t vs. int64_t)

Fixes the following compiler warning:

stats_statsd.c: In function ‘osmo_stats_reporter_create_statsd’: stats_statsd.c:54:18: warning: assignment from incompatible pointer type [-Wincompatible-pointer-types]
  srep->send_item = osmo_stats_reporter_statsd_send_item;

Change-Id: Id36914906e0982f6ac092a311210727de66b343a
3 files changed