Improve VxWorks GTHREAD_ONCE_INIT

2019-12-30  Olivier Hainque  <hainque@adacore.com>

	* config/gthr-vxworks.h (GTHREAD_ONCE_INIT): Use
	standard zero-initializer syntax.

From-SVN: r279776

libgcc/ChangeLog

 2019-12-30  Olivier Hainque  <hainque@adacore.com>
 
+	* config/gthr-vxworks.h (GTHREAD_ONCE_INIT): Use
+	standard zero-initializer syntax.
+
+2019-12-30  Olivier Hainque  <hainque@adacore.com>
+
 	* config/gthr-vxworks-tls.c (__gthread_getspecific): Fix
 	reference to the internal VX_GET_TLS_DATA interface.
 

libgcc/config/gthr-vxworks.h

@@ -215,7 +215,7 @@ typedef struct
 #endif
 } __gthread_once_t;
 
-#define __GTHREAD_ONCE_INIT { 0 }
+#define __GTHREAD_ONCE_INIT {}
 
 extern int __gthread_once (__gthread_once_t *__once, void (*__func)(void));