ivi-shell: initialize all fields in create_layout_transition

create_layout_transition does not initialize is_transition_func.

This patch initializes it to NULL.

Signed-off-by: John-John Tedro <johnjohn.tedro@gmail.com>
Reviewed-by: Bryce Harrington <bryce@osg.samsung.com>

ivi-shell/ivi-layout-transition.c

@@ -253,6 +253,7 @@ create_layout_transition(void)
 
 	transition->is_done = 0;
 
+	transition->is_transition_func = NULL;
 	transition->private_data = NULL;
 	transition->user_data = NULL;