Victor Toso authored Jan 22, 2019 and Frediano Ziglio committed Jan 22, 2019

Can't happen as GstElement *e is not NULL but not checking can yield
warning from compilers.

 > spice-gstaudio.c: In function ‘playback_volume_changed’:
 > /usr/include/glib-2.0/gobject/gtype.h:2280:70: error: potential null pointer dereference [-Werror=null-dereference]
 >  #define _G_TYPE_IGC(ip, gt, ct)         ((ct*) (((GTypeInstance*) ip)->g_class))
 >                                                 ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~
 > /usr/include/glib-2.0/gobject/gtype.h:525:66: note: in expansion of macro ‘_G_TYPE_IGC’
 >  #define G_TYPE_INSTANCE_GET_CLASS(instance, g_type, c_type)     (_G_TYPE_IGC ((instance), (g_type), c_type))
 >                                                                   ^~~~~~~~~~~
 > /usr/include/glib-2.0/gobject/gobject.h:86:38: note: in expansion of macro ‘G_TYPE_INSTANCE_GET_CLASS’
 >  #define G_OBJECT_GET_CLASS(object)  (G_TYPE_INSTANCE_GET_CLASS ((object), G_TYPE_OBJECT, GObjectClass))
 >                                       ^~~~~~~~~~~~~~~~~~~~~~~~~
 > spice-gstaudio.c:373:45: note: in expansion of macro ‘G_OBJECT_GET_CLASS’
 >      } else if (g_object_class_find_property(G_OBJECT_GET_CLASS (e), "volume") != NULL) {
 >                                              ^~~~~~~~~~~~~~~~~~

Signed-off-by: Victor Toso <victortoso@redhat.com>
Acked-by: Frediano Ziglio <fziglio@redhat.com>