perf stat: Use nftw() instead of ftw()

ftw() has been obsolete for about 12 years now.

Committer notes:

Further notes provided by the patch author:

"NOTE: Not runtime-tested, I have no idea what I need to do in perf
to test this. But at least it compiles now with my uClibc-based
toolchain."

I looked at the nftw()/ftw() man page and for the use made with cgroups
in 'perf stat' the end result is equivalent.

Fixes: bb1c15b60b98 ("perf stat: Support regex pattern in --for-each-cgroup")
Signed-off-by: Paul Cercueil <[e-mail]>
Cc: Alexander Shishkin <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: Mark Rutland <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: [e-mail]
Cc: [e-mail]
Link: http://lore.kernel.org/lkml/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/util/cgroup.c

···
 
 /* helper function for ftw() in match_cgroups and list_cgroups */
 static int add_cgroup_name(const char *fpath, const struct stat *sb __maybe_unused,
-			   int typeflag)
+			   int typeflag, struct FTW *ftwbuf __maybe_unused)
 {
 	struct cgroup_name *cn;
 
···
 			if (!s)
 				return -1;
 			/* pretend if it's added by ftw() */
-			ret = add_cgroup_name(s, NULL, FTW_D);
+			ret = add_cgroup_name(s, NULL, FTW_D, NULL);
 			free(s);
 			if (ret)
 				return -1;
 		} else {
-			if (add_cgroup_name("", NULL, FTW_D) < 0)
+			if (add_cgroup_name("", NULL, FTW_D, NULL) < 0)
 				return -1;
 		}
 
···
 	prefix_len = strlen(mnt);
 
 	/* collect all cgroups in the cgroup_list */
-	if (ftw(mnt, add_cgroup_name, 20) < 0)
+	if (nftw(mnt, add_cgroup_name, 20, 0) < 0)
 		return -1;
 
 	for (;;) {