perf tools: remove xstrndup, xmalloc, xzalloc

All the functions that call this can handle the equivalent, non
panic'ing wrapped routines.

Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Tom Zanussi <tzanussi@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/perf/util/path.c b/tools/perf/util/path.c
index b276c18..58a470d 100644
--- a/tools/perf/util/path.c
+++ b/tools/perf/util/path.c
@@ -152,5 +152,5 @@
 
 	if (path_len && !is_dir_sep(path[path_len - 1]))
 		return NULL;
-	return xstrndup(path, chomp_trailing_dir_sep(path, path_len));
+	return strndup(path, chomp_trailing_dir_sep(path, path_len));
 }