bus: ti-sysc: Fix sysc_unprepare() when no clocks have been allocated

bus: ti-sysc: Fix sysc_unprepare() when no clocks have been allocated

BugLink: https://bugs.launchpad.net/bugs/1863019
[ Upstream commit aaa29bb01cc4bf5a87dbdb219efba3b09f259d8e ]

If we return early before ddata->clocks have been allocated we will get a
NULL pointer dereference in sysc_unprepare(). Let's fix this by returning
early when no clocks are allocated.

Fixes: 0eecc636e5a2 ("bus: ti-sysc: Add minimal TI sysc interconnect target driver")
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>