[gvfs] pty_open: Prevent build warnings

[Ondrej Holy <oholy src gnome org>]

commit 31c0fcbf8ae8339c1f18c1a4f54020a93ff1d9e1
Author: Ondrej Holy <oholy redhat com>
Date:   Thu May 10 11:20:46 2018 +0200

    pty_open: Prevent build warnings
    
    Prevent the following build warning which is shown in some cases:
    warning: ignoring return value of 'chdir', declared with attribute
    warn_unused_result [-Wunused-result]

 daemon/pty_open.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/daemon/pty_open.c b/daemon/pty_open.c
index e0402d8..5d146a1 100644
--- a/daemon/pty_open.c
+++ b/daemon/pty_open.c
@@ -355,7 +355,9 @@ _pty_run_on_pty(int fd, gboolean login,
 
        /* Change to the requested directory. */
        if (directory != NULL) {
-               chdir(directory);
+               if (chdir(directory) == -1) {
+                       g_warning ("Error changing directory.");
+               }
        }
 
 #ifdef HAVE_UTMP_H