Simplify.

Zend/zend_compile.h

@@ -42,10 +42,10 @@
 #define HANDLE_INTERACTIVE()  if (CG(interactive)) { execute_new_code(TSRMLS_C); }
 
 #define RESET_DOC_COMMENT()      \
-    do {                         \
+    {                            \
         CG(doc_comment) = NULL;  \
         CG(doc_comment_len) = 0; \
-    } while (0)
+    }
 
 typedef struct _zend_op_array zend_op_array;
 typedef struct _zend_op zend_op;