[CPUFREQ] Propagate acpi_processor_preregister_performance return value.

Note how any error from acpi_processor_preregister_performance is ignored.

From: bert hubert <[e-mail]>
Signed-off-by: Dave Jones <[e-mail]>

arch/i386/kernel/cpu/cpufreq/acpi-cpufreq.c

···
 	}
 
 	/* Do initialization in ACPI core */
-	acpi_processor_preregister_performance(acpi_perf_data);
-	return 0;
+	return acpi_processor_preregister_performance(acpi_perf_data);
 }
 
 static int