ivi-layout-transition: Fix potential leak of memory pointed to by transition

ivi-layout-transition: Fix potential leak of memory pointed to by transition

Several fixes to handle invalid transition objects:

1. Free transition in ivi_layout_transition_fade_layer if we fail to
   allocate memory for data

2. Check if transition is not null and if layout_transition_register was
   ok before return, if not, free transition

3. Destroy transition if layout_transition_register was not ok, we can't
   just free transition, we need to call layout_transition_destroy in
   order to free private_data from transition

Signed-off-by: Lucas Tanure <tanure@linux.com>
Reviewed-by: Bryce Harrington <bryce@osg.samsung.com>