perf bpf: Remove misplaced __maybe_unused attribute

The bpf__setup_stdout() function uses that evlist argument, remove the
misleading __maybe_unused attribute.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: https://lkml.kernel.org/n/tip-7vbhhzbd33nvdm7l35gdfryt@git.kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/bpf-loader.c

@@ -1533,7 +1533,7 @@ int bpf__apply_obj_config(void)
 			(strcmp("__bpf_stdout__", 	\
 				bpf_map__name(pos)) == 0))
 
-int bpf__setup_stdout(struct perf_evlist *evlist __maybe_unused)
+int bpf__setup_stdout(struct perf_evlist *evlist)
 {
 	struct bpf_map_priv *tmpl_priv = NULL;
 	struct bpf_object *obj, *tmp;