Fix below build error:

reproduce:
  wget 
https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross
 -O ~/bin/make.cross
  chmod +x ~/bin/make.cross
  git checkout 9239d88fc5e58a2a72bc949362f999aac9bffb29
  # save the attached .config to linux build tree
  make.cross ARCH=arm

All error/warnings:

   In file included from include/linux/seqlock.h:35:0,
                    from include/linux/time.h:5,
                    from include/linux/stat.h:18,
                    from include/linux/module.h:10,
                    from drivers/staging/emxx_udc/emxx_udc.c:22:
   drivers/staging/emxx_udc/emxx_udc.c: In function 
'nbu2ss_gad_set_selfpowered':
>> drivers/staging/emxx_udc/emxx_udc.c:3129:21: error: 'udc' undeclared (first 
>> use in this function)
     spin_lock_irqsave(&udc->lock, flags);
                        ^
   include/linux/spinlock.h:215:34: note: in definition of macro 
'raw_spin_lock_irqsave'
      flags = _raw_spin_lock_irqsave(lock); \
                                     ^
>> drivers/staging/emxx_udc/emxx_udc.c:3129:2: note: in expansion of macro 
>> 'spin_lock_irqsave'
     spin_lock_irqsave(&udc->lock, flags);
     ^
   drivers/staging/emxx_udc/emxx_udc.c:3129:21: note: each undeclared 
identifier is reported only once for each function it appears in
     spin_lock_irqsave(&udc->lock, flags);
                        ^
   include/linux/spinlock.h:215:34: note: in definition of macro 
'raw_spin_lock_irqsave'
      flags = _raw_spin_lock_irqsave(lock); \
                                     ^
>> drivers/staging/emxx_udc/emxx_udc.c:3129:2: note: in expansion of macro 
>> 'spin_lock_irqsave'
     spin_lock_irqsave(&udc->lock, flags);
     ^

vim +/udc +3129 drivers/staging/emxx_udc/emxx_udc.c

33aa8d45 Magnus Damm 2014-06-06  3123
33aa8d45 Magnus Damm 2014-06-06  3124   if (pgadget == NULL) {
33aa8d45 Magnus Damm 2014-06-06  3125           ERR("%s, bad param\n", 
__func__);
33aa8d45 Magnus Damm 2014-06-06  3126           return -EINVAL;
33aa8d45 Magnus Damm 2014-06-06  3127   }
33aa8d45 Magnus Damm 2014-06-06  3128
33aa8d45 Magnus Damm 2014-06-06 @3129   spin_lock_irqsave(&udc->lock, flags);
9239d88f Peter Chen  2015-01-28  3130   pgadget->is_selfpowered = 
(is_selfpowered != 0);
33aa8d45 Magnus Damm 2014-06-06  3131   spin_unlock_irqrestore(&udc->lock, 
flags);
33aa8d45 Magnus Damm 2014-06-06  3132

Signed-off-by: Peter Chen <peter.c...@freescale.com>
---
 drivers/staging/emxx_udc/emxx_udc.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/staging/emxx_udc/emxx_udc.c 
b/drivers/staging/emxx_udc/emxx_udc.c
index 1d3135a..bd70ea0 100644
--- a/drivers/staging/emxx_udc/emxx_udc.c
+++ b/drivers/staging/emxx_udc/emxx_udc.c
@@ -3117,6 +3117,7 @@ static int nbu2ss_gad_wakeup(struct usb_gadget *pgadget)
 static int nbu2ss_gad_set_selfpowered(struct usb_gadget *pgadget,
                                        int is_selfpowered)
 {
+       struct nbu2ss_udc       *udc;
        unsigned long           flags;
 
 /*     INFO("=== %s()\n", __func__); */
@@ -3126,6 +3127,8 @@ static int nbu2ss_gad_set_selfpowered(struct usb_gadget 
*pgadget,
                return -EINVAL;
        }
 
+       udc = container_of(pgadget, struct nbu2ss_udc, gadget);
+
        spin_lock_irqsave(&udc->lock, flags);
        pgadget->is_selfpowered = (is_selfpowered != 0);
        spin_unlock_irqrestore(&udc->lock, flags);
-- 
1.9.1

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