tools lib api fs tracing_path: Make tracing_events_path private

Not anymore accessed outside this library, keep it private.

Cc: Adrian Hunter <[e-mail]>
Cc: David Ahern <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Cc: Wang Nan <[e-mail]>
Link: https://lkml.kernel.org/n/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/lib/api/fs/tracing_path.c

···
 
 static char tracing_mnt[PATH_MAX]  = "/sys/kernel/debug";
 static char tracing_path[PATH_MAX]        = "/sys/kernel/debug/tracing";
-char tracing_events_path[PATH_MAX] = "/sys/kernel/debug/tracing/events";
-
+static char tracing_events_path[PATH_MAX] = "/sys/kernel/debug/tracing/events";
 
 static void __tracing_path_set(const char *tracing, const char *mountpoint)
 {

tools/lib/api/fs/tracing_path.h

···
 #include <linux/types.h>
 #include <dirent.h>
 
-extern char tracing_events_path[];
-
 DIR *tracing_events__opendir(void);
 
 void tracing_path_set(const char *mountpoint);