perf top: Don't use globals where not needed to

Some variables were global but used in just one function, so move it to
where it belongs.

Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-3gddcwclncio29a7jiey0qtq@git.kernel.orgSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-top.c

@@ -1159,11 +1159,6 @@ parse_callchain_opt(const struct option *opt, const char *arg, int unset)
 	return 0;
 }
 
-static const char * const top_usage[] = {
-	"perf top [<options>]",
-	NULL
-};
-
 int cmd_top(int argc, const char **argv, const char *prefix __maybe_unused)
 {
 	struct perf_evsel *pos;
@@ -1250,6 +1245,10 @@ int cmd_top(int argc, const char **argv, const char *prefix __maybe_unused)
 	OPT_STRING('u', "uid", &top.target.uid_str, "user", "user to profile"),
 	OPT_END()
 	};
+	const char * const top_usage[] = {
+		"perf top [<options>]",
+		NULL
+	};
 
 	top.evlist = perf_evlist__new(NULL, NULL);
 	if (top.evlist == NULL)