perf coresight: Remove superfluous check before use

The cs_etm_evsel variable is guaranteed to be set at this point in
cs_etm_recording_options().
Signed-off-by: Kim Phillips <kim.phillips@arm.com>
Acked-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/20170615125521.80cc128dc856bc1f2e61b730@arm.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/arch/arm/util/cs-etm.c

@@ -203,19 +203,18 @@ static int cs_etm_recording_options(struct auxtrace_record *itr,
 		pr_debug2("%s snapshot size: %zu\n", CORESIGHT_ETM_PMU_NAME,
 			  opts->auxtrace_snapshot_size);
 
-	if (cs_etm_evsel) {
 	/*
 	 * To obtain the auxtrace buffer file descriptor, the auxtrace
 	 * event must come first.
 	 */
 	perf_evlist__to_front(evlist, cs_etm_evsel);
+
 	/*
 	 * In the case of per-cpu mmaps, we need the CPU on the
 	 * AUX event.
 	 */
 	if (!cpu_map__empty(cpus))
 		perf_evsel__set_sample_bit(cs_etm_evsel, CPU);
-	}
 
 	/* Add dummy event to keep tracking */
 	if (opts->full_auxtrace) {