pgrep: fix compiler warning saved_start_time might be used uninitialized

A patch from Debian.

Bug-Debian: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=197342
Backported-by: Sami Kerola <kerolasa@iki.fi>

pgrep.c

@@ -435,7 +435,8 @@ static union el * select_procs (int *num)
 	preg = do_regcomp();
 
 	if (opt_newest) saved_start_time =  0ULL;
-	if (opt_oldest) saved_start_time = ~0ULL;
+	else saved_start_time = ~0ULL;
+
 	if (opt_newest) saved_pid = 0;
 	if (opt_oldest) saved_pid = INT_MAX;