[atomic] Cannot fail anymore
diff --git a/src/hb-atomic.hh b/src/hb-atomic.hh
index 93265f6..e640d1b 100644
--- a/src/hb-atomic.hh
+++ b/src/hb-atomic.hh
@@ -102,20 +102,12 @@
#define hb_atomic_ptr_impl_cmpexch(P,O,N) _hb_atomic_ptr_impl_cmplexch ((const void **) (P), (O), (N))
-#elif defined(HB_NO_MT)
+#else /* defined(HB_NO_MT) */
#define hb_atomic_int_impl_add(AI, V) ((*(AI) += (V)) - (V))
-
#define _hb_memory_barrier() do {} while (0)
-
#define hb_atomic_ptr_impl_cmpexch(P,O,N) (* (void **) (P) == (void *) (O) ? (* (void **) (P) = (void *) (N), true) : false)
-
-#else
-
-#error "Could not find any system to define atomic_int macros."
-#error "Check hb-atomic.hh for possible resolutions."
-
#endif
