perf probe: Delete an unnecessary check before the function call "strfilter__delete"

The strfilter__delete() function tests whether its argument is NULL and
then returns immediately. Thus the test around the call is not needed.

This issue was detected by using the Coccinelle software.
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Julia Lawall <julia.lawall@lip6.fr>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: kernel-janitors@vger.kernel.org
Link: http://lkml.kernel.org/r/5597751A.5000506@users.sourceforge.netSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-probe.c

@@ -297,7 +297,6 @@ static void cleanup_params(void)
 		clear_perf_probe_event(params.events + i);
 	line_range__clear(&params.line_range);
 	free(params.target);
-	if (params.filter)
 	strfilter__delete(params.filter);
 	memset(&params, 0, sizeof(params));
 }