Hi Herbert,

[auto build test ERROR on net/master]
[also build test ERROR on v4.4 next-20160122]
[if your patch is applied to the wrong git tree, please drop us a note to help improving the system]

url:    https://github.com/0day-ci/linux/commits/Herbert-Xu/crypto-Use-skcipher-and-ahash-shash-where-possible/20160124-212323
config: x86_64-randconfig-x016-201604 (attached as .config)
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   drivers/usb/wusbcore/crypto.c: In function 'wusb_ccm_mac':

quoted

drivers/usb/wusbcore/crypto.c:266:2: error: implicit declaration of function 'skcipher_request_zero' [-Werror=implicit-function-declaration]

     skcipher_request_zero(req);
     ^
   cc1: some warnings being treated as errors

vim +/skcipher_request_zero +266 drivers/usb/wusbcore/crypto.c

   260		sg_init_one(&sg_dst, dst_buf, dst_size);
   261	
   262		skcipher_request_set_tfm(req, tfm_cbc);
   263		skcipher_request_set_callback(req, 0, NULL, NULL);
   264		skcipher_request_set_crypt(req, sg, &sg_dst, dst_size, iv);
   265		result = crypto_skcipher_encrypt(req);
 > 266		skcipher_request_zero(req);
   267		if (result < 0) {
   268			printk(KERN_ERR "E: can't compute CBC-MAC tag (MIC): %d\n",
   269			       result);

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