perf inject: 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.

Leftover from patch at the beggining of this series.

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-9cer20zhw64wbxyb0zias82i@git.kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-inject.c

@@ -242,11 +242,6 @@ static int __cmd_inject(struct perf_inject *inject)
 	return ret;
 }
 
-static const char * const report_usage[] = {
-	"perf inject [<options>]",
-	NULL
-};
-
 int cmd_inject(int argc, const char **argv, const char *prefix __maybe_unused)
 {
 	struct perf_inject inject = {
@@ -273,14 +268,18 @@ int cmd_inject(int argc, const char **argv, const char *prefix __maybe_unused)
 			 "be more verbose (show build ids, etc)"),
 		OPT_END()
 	};
+	const char * const inject_usage[] = {
+		"perf inject [<options>]",
+		NULL
+	};
 
-	argc = parse_options(argc, argv, options, report_usage, 0);
+	argc = parse_options(argc, argv, options, inject_usage, 0);
 
 	/*
 	 * Any (unrecognized) arguments left?
 	 */
 	if (argc)
-		usage_with_options(report_usage, options);
+		usage_with_options(inject_usage, options);
 
 	if (symbol__init() < 0)
 		return -1;