acpi: Replace weird use of PTR_RET.
This functions is really weird. It sets rc to -ENOMEM, then overrides it. It was converted to PTR_RET in a1458187 when it should have simply been rewritten. This version makes it more explicit, with a single IS_ERR() test. Cc: Alexandru Gheorghiu <gheorghiuandru@gmail.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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