[gupnp] Prevent possible crash if device disappears

[Jens Georg <jensgeorg src gnome org>]

commit 791f702c8e4d1fed0f456d35be97a354813d4dd5
Author: Jens Georg <mail jensge org>
Date:   Thu Aug 4 15:01:54 2011 +0200

    Prevent possible crash if device disappears
    
    Might happen e.g. on usbnet devices when cable is unplugged.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=655970

 libgupnp/gupnp-linux-context-manager.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/libgupnp/gupnp-linux-context-manager.c b/libgupnp/gupnp-linux-context-manager.c
index dce036e..a0f1cfc 100644
--- a/libgupnp/gupnp-linux-context-manager.c
+++ b/libgupnp/gupnp-linux-context-manager.c
@@ -311,7 +311,10 @@ remove_context (GUPnPLinuxContextManager *self, struct ifaddrmsg *ifa)
         device = g_hash_table_lookup (self->priv->interfaces,
                                       GINT_TO_POINTER (ifa->ifa_index));
 
-        if (device && device->context) {
+        if (!device)
+                return;
+
+        if (device->context) {
                 if (device->flags & NETWORK_INTERFACE_UP)
                         g_signal_emit_by_name (self,
                                                "context-unavailable",