newlib: fix errors for GCC 8 support

components/newlib/include/sys/reent.h:405:11: error: unnecessary parentheses in declaration of '_sig_func' [-Werror=parentheses]
   void (**(_sig_func))(int);
           ^

diff --git a/components/newlib/include/sys/reent.h b/components/newlib/include/sys/reent.h
index ee40961894ab86703d65a5ea4c96683a5b6155a1..b35595a7d4a18d431a5b3599ff3757af62f3bdd5 100644 (file)
--- a/components/newlib/include/sys/reent.h
+++ b/components/newlib/include/sys/reent.h
@@ -402,7 +402,7 @@ struct _reent
   char *_asctime_buf;
 
   /* signal info */
-  void (**(_sig_func))(int);
+  void (**_sig_func)(int);
 
 # ifndef _REENT_GLOBAL_ATEXIT
   /* atexit stuff */