Fix C++-style comment (xlc compilation failure)
diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
index af4a13a..2795168 100644
--- a/Objects/unicodeobject.c
+++ b/Objects/unicodeobject.c
@@ -9146,7 +9146,7 @@
/* We do not need to compare 0 and len(substring)-1 because
the if statement above ensured already that they are equal
when we end up here. */
- // TODO: honor direction and do a forward or backwards search
+ /* TODO: honor direction and do a forward or backwards search */
for (i = 1; i < end_sub; ++i) {
if (PyUnicode_READ(kind_self, data_self, offset + i) !=
PyUnicode_READ(kind_sub, data_sub, i))