Fix more semi-colon issues
diff --git a/src/hb-coretext.cc b/src/hb-coretext.cc
index 3834285..85993d1 100644
--- a/src/hb-coretext.cc
+++ b/src/hb-coretext.cc
@@ -608,7 +608,7 @@
 
 #define ALLOCATE_ARRAY(Type, name, len, on_no_room) \
   Type *name = (Type *) scratch; \
-  { \
+  do { \
     unsigned int _consumed = DIV_CEIL ((len) * sizeof (Type), sizeof (*scratch)); \
     if (unlikely (_consumed > scratch_size)) \
     { \
@@ -617,7 +617,7 @@
     } \
     scratch += _consumed; \
     scratch_size -= _consumed; \
-  }
+  } while (0)
 
   ALLOCATE_ARRAY (UniChar, pchars, buffer->len * 2, /*nothing*/);
   unsigned int chars_len = 0;