Fix authentication on hpux and Hurd

libxcb's 010e5661 (Fix XDM-AUTHORIZATION-1 (bug #14202)) mistakenly
inverted a few lines of code, making local socket authentication fail on
hpux and Hurd: when getpeername fails, sockname needs to be initialized
by getsockname before its address family can be checked.

Signed-off-by: Samuel Thibault <samuel.thiba...@ens-lyon.org>

diff --git a/src/xcb_auth.c b/src/xcb_auth.c
index 104f2f0..00aad23 100644
--- a/src/xcb_auth.c
+++ b/src/xcb_auth.c
@@ -260,10 +260,10 @@ int _xcb_get_auth_info(int fd, xcb_auth_info_t *info, int 
display)
      * case anyway.*/
     if (getpeername(fd, sockname, &socknamelen) == -1)
     {
-        if (sockname->sa_family != AF_UNIX)
-            return 0;   /* except for AF_UNIX, sockets should have peernames */
         if (getsockname(fd, sockname, &socknamelen) == -1)
             return 0;   /* can only authenticate sockets */
+        if (sockname->sa_family != AF_UNIX)
+            return 0;   /* except for AF_UNIX, sockets should have peernames */
         gotsockname = 1;
     }
 
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