perf evsel: Remove superfluous nthreads system_wide setup in alloc_fd()

It's already setup in the only caller of this method in
perf_evsel__open(), right before calling perf_evsel__alloc_fd(), no need
to do it again.

Also it's better to have it out of the function before we move it to
libperf.
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lkml.kernel.org/n/tip-1k8lhyjxfk7o8v4g3r7eyjc9@git.kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/evsel.c

@@ -1148,9 +1148,6 @@ void perf_evsel__config(struct perf_evsel *evsel, struct record_opts *opts,
 
 static int perf_evsel__alloc_fd(struct perf_evsel *evsel, int ncpus, int nthreads)
 {
-	if (evsel->system_wide)
-		nthreads = 1;
-
 	evsel->fd = xyarray__new(ncpus, nthreads, sizeof(int));
 
 	if (evsel->fd) {