Proper do {} while (0) idiom in TIMESPEC_TO_TIMEVAL/TIMEVAL_TO_TIMESPEC

From Scott Cheloha, ok tb@

diff --git a/sys/sys/time.h b/sys/sys/time.h
index e2e1dd6..7bd9994 100644 (file)
--- a/sys/sys/time.h
+++ b/sys/sys/time.h
@@ -1,4 +1,4 @@
-/*     $OpenBSD: time.h,v 1.36 2016/09/12 19:41:20 guenther Exp $      */
+/*     $OpenBSD: time.h,v 1.37 2017/12/11 23:31:16 jca Exp $   */
 /*     $NetBSD: time.h,v 1.18 1996/04/23 10:29:33 mycroft Exp $        */
 
 /*
@@ -60,14 +60,14 @@ struct timespec {
 };
 #endif
 
-#define        TIMEVAL_TO_TIMESPEC(tv, ts) {                                   \
+#define        TIMEVAL_TO_TIMESPEC(tv, ts) do {                                \
        (ts)->tv_sec = (tv)->tv_sec;                                    \
        (ts)->tv_nsec = (tv)->tv_usec * 1000;                           \
-}
-#define        TIMESPEC_TO_TIMEVAL(tv, ts) {                                   \
+} while (0)
+#define        TIMESPEC_TO_TIMEVAL(tv, ts) do {                                \
        (tv)->tv_sec = (ts)->tv_sec;                                    \
        (tv)->tv_usec = (ts)->tv_nsec / 1000;                           \
-}
+} while (0)
 
 struct timezone {
        int     tz_minuteswest; /* minutes west of Greenwich */