x86/olpc/xo1/sci: Don't call input_free_device() after input_unregister_device()

input_free_device() should only be used if
input_register_device() was not called yet or if it failed. Once
device was unregistered use input_unregister_device() and memory
will be freed once last reference to the device is dropped.

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Cc: dsd@laptop.org
Cc: pgf@laptop.org
Cc: gregkh@linuxfoundation.org
Link: http://lkml.kernel.org/r/CAPgLHd84cboeucog%2BYNdHvGqTfTROujDKZgSkh3o0B-Q93ee2A@mail.gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

arch/x86/platform/olpc/olpc-xo1-sci.c

@@ -460,7 +460,6 @@ static int setup_power_button(struct platform_device *pdev)
 static void free_power_button(void)
 {
 	input_unregister_device(power_button_idev);
-	input_free_device(power_button_idev);
 }
 
 static int setup_ebook_switch(struct platform_device *pdev)
@@ -491,7 +490,6 @@ static int setup_ebook_switch(struct platform_device *pdev)
 static void free_ebook_switch(void)
 {
 	input_unregister_device(ebook_switch_idev);
-	input_free_device(ebook_switch_idev);
 }
 
 static int setup_lid_switch(struct platform_device *pdev)
@@ -526,6 +524,7 @@ static int setup_lid_switch(struct platform_device *pdev)
 
 err_create_attr:
 	input_unregister_device(lid_switch_idev);
+	lid_switch_idev = NULL;
 err_register:
 	input_free_device(lid_switch_idev);
 	return r;
@@ -535,7 +534,6 @@ static void free_lid_switch(void)
 {
 	device_remove_file(&lid_switch_idev->dev, &dev_attr_lid_wake_mode);
 	input_unregister_device(lid_switch_idev);
-	input_free_device(lid_switch_idev);
 }
 
 static int xo1_sci_probe(struct platform_device *pdev)