pmdomain: arm: Fix NULL dereference on scmi_perf_domain removal

In the Linux kernel, the following vulnerability has been resolved:

pmdomain: arm: Fix NULL dereference on scmi_perf_domain removal

On unloading of the scmi_perf_domain module got the below splat, when in

the DT provided to the system under test the '#power-domain-cells' property

was missing. Indeed, this particular setup causes the probe to bail out

early without giving any error, which leads to the ->remove() callback gets

to run too, but without all the expected initialized structures in place.

Add a check and bail out early on remove too.

Call trace:

scmi_perf_domain_remove+0x28/0x70 [scmi_perf_domain]

scmi_dev_remove+0x28/0x40 [scmi_core]

device_remove+0x54/0x90

device_release_driver_internal+0x1dc/0x240

driver_detach+0x58/0xa8

bus_remove_driver+0x78/0x108

driver_unregister+0x38/0x70

scmi_driver_unregister+0x28/0x180 [scmi_core]

scmi_perf_domain_driver_exit+0x18/0xb78 [scmi_perf_domain]

__arm64_sys_delete_module+0x1a8/0x2c0

invoke_syscall+0x50/0x128

el0_svc_common.constprop.0+0x48/0xf0

do_el0_svc+0x24/0x38

el0_svc+0x34/0xb8

el0t_64_sync_handler+0x100/0x130

el0t_64_sync+0x190/0x198

Code: a90153f3 f9403c14 f9414800 955f8a05 (b9400a80)

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