curl_setup_once: Remove ERRNO/SET_ERRNO macros

Prior to this change (SET_)ERRNO mapped to GetLastError/SetLastError
for Win32 and regular errno otherwise.

I reviewed the code and found no justifiable reason for conflating errno
on WIN32 with GetLastError/SetLastError. All Win32 CRTs support errno,
and any Win32 multithreaded CRT supports thread-local errno.

Fixes https://github.com/curl/curl/issues/895
Closes https://github.com/curl/curl/pull/1589

1 files changed, 3 insertions, 3 deletions

diff --git a/lib/inet_pton.c b/lib/inet_pton.c
index 475f44abc..fef9610d1 100644
--- a/lib/inet_pton.c
+++ b/lib/inet_pton.c
@@ -57,8 +57,8 @@ static int      inet_pton6(const char *src, unsigned char *dst);
  * notice:
  *      On Windows we store the error in the thread errno, not
  *      in the winsock error code. This is to avoid losing the
- *      actual last winsock error. So use macro ERRNO to fetch the
- *      errno this function sets when returning (-1), not SOCKERRNO.
+ *      actual last winsock error. So when this function returns
+ *      -1, check errno not SOCKERRNO.
  * author:
  *      Paul Vixie, 1996.
  */
@@ -73,7 +73,7 @@ Curl_inet_pton(int af, const char *src, void *dst)
     return (inet_pton6(src, (unsigned char *)dst));
 #endif
   default:
-    SET_ERRNO(EAFNOSUPPORT);
+    errno = EAFNOSUPPORT;
     return (-1);
   }
   /* NOTREACHED */