Add do while for RETURNFUNC -- helps catch syntax errors

src/misc.h

@@ -142,10 +142,10 @@ extern HAMLIB_EXPORT(int) parse_hoststr(char *host, char hoststr[256], char port
 void errmsg(int err, char *s, const char *func, const char *file, int line);
 #define ERRMSG(err, s) errmsg(err,  s, __func__, __FILENAME__, __LINE__)
 #define ENTERFUNC rig_debug(RIG_DEBUG_VERBOSE, "%s(%d):%s entered\n", __FILENAME__, __LINE__, __func__)
-#define RETURNFUNC(rc) { \
+#define RETURNFUNC(rc) do { \
                         rig_debug(RIG_DEBUG_VERBOSE, "%s(%d):%s return\n", __FILENAME__, __LINE__, __func__); \
                         return rc; \
-                       }
+                       } while(0)
 
 #if 0 // 5.0
     elapsed_ms(&rig->state.cache.time_freqMainC, HAMLIB_ELAPSED_INVALIDATE);