undefined reference to `dib3000mc_pid_parse'

[kbuild test robot]

Hi Kirill,

It's probably a bug fix that unveils the link errors.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   62ea1ec5e17fe36e2c728bc534f9f78b216dfe83
commit: 51b97e354ba9fce1890cf38ecc754aa49677fc89 kernel: use the gnu89 standard explicitly
date:   1 year, 1 month ago
config: x86_64-randconfig-a0-12081135 (attached as .config)
reproduce:
        git checkout 51b97e354ba9fce1890cf38ecc754aa49677fc89
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   drivers/built-in.o: In function `dibusb_dib3000mc_frontend_attach':
>> (.text+0x207627): undefined reference to `dib3000mc_pid_parse'
   drivers/built-in.o: In function `dibusb_dib3000mc_frontend_attach':
>> (.text+0x20762f): undefined reference to `dib3000mc_pid_control'
   drivers/built-in.o: In function `dibusb_dib3000mc_tuner_attach':
   (.text+0x20773a): undefined reference to `dib3000mc_get_tuner_i2c_master'
   drivers/built-in.o: In function `dibusb_dib3000mc_tuner_attach':
>> (.text+0x207822): undefined reference to `dib3000mc_set_config'

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