[mutter] wayland: Do not fail on stalled .X11-unix entries

[Olivier Fourdan <ofourdan src gnome org>]

commit 589e999049d00d56aafcc2fa3c1e63cee5b3182b
Author: Olivier Fourdan <ofourdan redhat com>
Date:   Fri Feb 2 16:35:26 2018 +0100

    wayland: Do not fail on stalled .X11-unix entries
    
    If for whatever reason, there are stalled files in /tmp/.X11-unix/ the
    bind() to the abstract socket will succeed but not the bind() to the
    to the UNIX socket.
    
    This causes gnome-shell/mutter to fail because it cannot start Xwayland
    (while it could actually, by using a different display).
    
    In case of failure to bind to the UNIX socket, try the next display
    instead of failing, to avoid stalled entries in /tmp/.X11-unix.
    
    Closes: https://gitlab.gnome.org/GNOME/mutter/issues/13

 src/wayland/meta-xwayland.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/src/wayland/meta-xwayland.c b/src/wayland/meta-xwayland.c
index b185c0a5f..19b95c636 100644
--- a/src/wayland/meta-xwayland.c
+++ b/src/wayland/meta-xwayland.c
@@ -465,7 +465,8 @@ choose_xdisplay (MetaXWaylandManager *manager)
         {
           unlink (lock_file);
           close (manager->abstract_fd);
-          return FALSE;
+          display++;
+          continue;
         }
 
       break;