(QUIT): Give it statement form.

src/ChangeLog

@@ -1,3 +1,7 @@
+1999-11-02  Gerd Moellmann  <gerd@gnu.org>
+
+	* lisp.h (QUIT): Give it statement form.
+
 1999-11-02  Dave Love  <fx@gnu.org>
 
 	* eval.c (init_eval): Conditionalize declaration of gcpro_level.

src/lisp.h

@@ -1499,9 +1499,14 @@ extern char *stack_bottom;
    This is a good thing to do around a loop that has no side effects
    and (in particular) cannot call arbitrary Lisp code.  */
 
-#define QUIT \
-  if (!NILP (Vquit_flag) && NILP (Vinhibit_quit)) \
-    { Vquit_flag = Qnil; Fsignal (Qquit, Qnil); }
+#define QUIT						\
+  do {							\
+    if (!NILP (Vquit_flag) && NILP (Vinhibit_quit))	\
+      {							\
+	Vquit_flag = Qnil;				\
+	Fsignal (Qquit, Qnil);				\
+      }							\
+  } while (0)
 
 /* Nonzero if ought to quit now.  */