ctdb-common: Align integer type

ctdb-common: Align integer type

[132/416] Compiling ctdb/common/run_event.c
../../common/run_event.c: In function ‘run_event_fail’:
../../common/run_event.c:806:50: warning: comparison of integer expressions of different signedness: ‘id_t’ {aka ‘unsigned int’} and ‘int’ [-Wsign-compare]
  806 |         if (script->summary == -ETIMEDOUT && pid != -1) {
      |                                                  ^~

This is actually due to a typo in commit
20e9f203627752c4c1934e4bc0776e26c0dfb00e.  It should always have been
pid_t.

Signed-off-by: Martin Schwenke <mschwenke@ddn.com>
Reviewed-by: Volker Lendecke <vl@samba.org>