[network-manager-applet] libnma/cert-chooser: avoid crash when gck slot is NULL

[Beniamino Galvani <bgalvani src gnome org>]

commit 5abd5e9f2739881d15d61246cd149e97f1d4d6af
Author: Beniamino Galvani <bgalvani redhat com>
Date:   Tue May 8 11:08:33 2018 +0200

    libnma/cert-chooser: avoid crash when gck slot is NULL
    
    Fixes: 2644d631afd072f66878799e75c5aa1947510c7a
    
    https://bugzilla.redhat.com/show_bug.cgi?id=1574908

 src/libnma/nma-cert-chooser-button.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/src/libnma/nma-cert-chooser-button.c b/src/libnma/nma-cert-chooser-button.c
index 0065176..5e770bc 100644
--- a/src/libnma/nma-cert-chooser-button.c
+++ b/src/libnma/nma-cert-chooser-button.c
@@ -64,6 +64,8 @@ is_this_a_slot_nobody_loves (GckSlot *slot)
        gboolean ret_value = FALSE;
 
        slot_info = gck_slot_get_info (slot);
+       if (!slot_info)
+               return TRUE;
 
        /* The p11-kit CA trusts do use their filesystem paths for description. */
        if (g_str_has_prefix (slot_info->slot_description, "/"))