Add _REENT_ERRNO(ptr)

Add a _REENT_ERRNO() macro to encapsulate the access to the
_errno member of struct reent. This will help to replace the
structure member with a thread-local storage object in a follow
up patch.

Replace uses of __errno_r() with _REENT_ERRNO().  Keep __errno_r() macro for
potential users outside of Newlib.

1 files changed, 1 insertions, 1 deletions

diff --git a/newlib/libc/errno/errno.c b/newlib/libc/errno/errno.c
index fd1743d73..70402924b 100644
--- a/newlib/libc/errno/errno.c
+++ b/newlib/libc/errno/errno.c
@@ -10,7 +10,7 @@
 int *
 __errno ()
 {
-  return &_REENT->_errno;
+  return &_REENT_ERRNO(_REENT);
 }
 
 #endif