ACPI: delete acpi_os_free(), use kfree() directly

Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/drivers/acpi/processor_perflib.c b/drivers/acpi/processor_perflib.c
index 14a00e5..7ba5e49 100644
--- a/drivers/acpi/processor_perflib.c
+++ b/drivers/acpi/processor_perflib.c
@@ -216,7 +216,7 @@
 	       sizeof(struct acpi_pct_register));
 
       end:
-	acpi_os_free(buffer.pointer);
+	kfree(buffer.pointer);
 
 	return result;
 }
@@ -294,7 +294,7 @@
 	}
 
       end:
-	acpi_os_free(buffer.pointer);
+	kfree(buffer.pointer);
 
 	return result;
 }
@@ -592,7 +592,7 @@
 	}
 
 end:
-	acpi_os_free(buffer.pointer);
+	kfree(buffer.pointer);
 	return result;
 }