lib/, src/: Always pass NULL to time(2)

See time(2):

BUGS
     Error returns from this system  call  are  indistinguishable  from
     successful  reports  that  the  time  is  a few seconds before the
     Epoch, so the C library wrapper function never sets errno as a re‐
     sult of this call.

     The tloc argument is obsolescent and should always be NULL in  new
     code.  When tloc is NULL, the call cannot fail.

Fixes: 45c6603cc8 ("[svn-upgrade] Integrating new upstream version, shadow (19990709)")
Signed-off-by: Alejandro Colomar <alx@kernel.org>

lib/failure.c

@@ -82,7 +82,7 @@ void failure (uid_t uid, const char *tty, struct faillog *fl)
 	}
 
 	STRTCPY(fl->fail_line, tty);
-	(void) time (&fl->fail_time);
+	fl->fail_time = time(NULL);
 
 	/*
 	 * Seek back to the correct position in the file and write the
@@ -126,7 +126,7 @@ static bool too_many_failures (const struct faillog *fl)
 		return true;	/* locked until reset manually */
 	}
 
-	(void) time (&now);
+	now = time(NULL);
 	if ((fl->fail_time + fl->fail_locktime) < now) {
 		return false;	/* enough time since last failure */
 	}

lib/log.c

@@ -79,7 +79,7 @@ void dolastlog (
 	}
 
 	ll_time = newlog.ll_time;
-	(void) time (&ll_time);
+	ll_time = time(NULL);
 	newlog.ll_time = ll_time;
 	STRTCPY(newlog.ll_line, line);
 #if HAVE_LL_HOST

lib/sulog.c

@@ -68,7 +68,7 @@ void sulog (const char *tty, bool success, const char *oldname, const char *name
 		return;		/* can't open or create logfile */
 	}
 
-	(void) time (&now);
+	now = time(NULL);
 	tm = localtime (&now);
 
 	fprintf (fp, "SU %.02d/%.02d %.02d:%.02d %c %s %s-%s\n",