[glib] gutils: Fix minor memory leak on error path

[Philip Withnall <pwithnall src gnome org>]

commit 0d49cd1b11b1bd0bae2671da9ddd83a6227eb947
Author: Philip Withnall <withnall endlessm com>
Date:   Mon Nov 6 10:31:52 2017 +0000

    gutils: Fix minor memory leak on error path
    
    Introduced in commit d011223085063ff23589fb92c7e68bcfb50fdd02.
    
    Coverity CID: 1382472
    
    Signed-off-by: Philip Withnall <withnall endlessm com>

 glib/gutils.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/glib/gutils.c b/glib/gutils.c
index 32c5796..de4401a 100644
--- a/glib/gutils.c
+++ b/glib/gutils.c
@@ -989,6 +989,8 @@ g_get_host_name (void)
 #ifndef G_OS_WIN32
       gchar *tmp = g_malloc (sizeof (gchar) * 100);
       failed = (gethostname (tmp, sizeof (gchar) * 100) == -1);
+      if (failed)
+        g_clear_pointer (&tmp, g_free);
       utmp = tmp;
 #else
       wchar_t tmp[MAX_COMPUTERNAME_LENGTH + 1];