Update from https://crrev.com/316786

third_party/harfbuzz-ng/src/hb-icu.cc

Index: third_party/harfbuzz-ng/src/hb-icu.cc
diff --git a/third_party/harfbuzz-ng/src/hb-icu.cc b/third_party/harfbuzz-ng/src/hb-icu.cc
index 86c8b5cc5a234188b357ad6dfd5ec8068dab618e..24cec9d7266bb01a98c084280768ade6ef15b57e 100644
--- a/third_party/harfbuzz-ng/src/hb-icu.cc
+++ b/third_party/harfbuzz-ng/src/hb-icu.cc
@@ -363,10 +363,8 @@ hb_icu_get_unicode_funcs (void)
   if (!hb_atomic_ptr_get (&normalizer)) {
     UErrorCode icu_err = U_ZERO_ERROR;
     /* We ignore failure in getNFCInstace(). */
-    hb_atomic_ptr_cmpexch (&normalizer, NULL, unorm2_getNFCInstance (&icu_err));
+    (void) hb_atomic_ptr_cmpexch (&normalizer, NULL, unorm2_getNFCInstance (&icu_err));
   }
 #endif
   return const_cast<hb_unicode_funcs_t *> (&_hb_icu_unicode_funcs);
 }
-
-