[lib] Remove unused owl_timestamp_is_null()

TODO.t2t

@@ -89,14 +89,6 @@ Work to do in OwlPS
 
 
 
-= libowlps =
-
-- Currently unused functions:
-  - owl_timestamp_is_null()
-
-
-
-
 = Aggregator =
 
 - Flush the requests' list when exiting.

libowlps/libowlps.c

@@ -230,13 +230,6 @@ bool owl_timestamp_equals(const owl_timestamp *const d1,
 }
 
 
-bool owl_timestamp_is_null(const owl_timestamp *const d)
-{
-  assert(d) ;
-  return d->tv_sec == 0 && d->tv_nsec == 0 ;
-}
-
-
 /*
  * Converts a owl_timestamp date value into milliseconds.
  */

libowlps/owlps.h

@@ -240,7 +240,6 @@ void owl_timeval_to_timestamp(const struct timeval *const src,
                               owl_timestamp *const dst) ;
 bool owl_timestamp_equals(const owl_timestamp *const d1,
                           const owl_timestamp *const d2) ;
-bool owl_timestamp_is_null(const owl_timestamp *const d) ;
 uint64_t owl_timestamp_to_ms(const owl_timestamp *const d) ;
 void owl_timestamp_to_string(const owl_timestamp *const src,
                              char *const dst) ;