[spi:for-5.2 53/62] drivers/spi/spi-bcm2835aux.c:40:14: sparse: symbol 'polling_limit_us' was not declared. Should it be static?

[kbuild test robot <lkp@xxxxxxxxx>]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git for-5.2
head:   8048d151eb4d74d5c533dbe10a846ea0b7495c6b
commit: 5fd917afc4bfe77686a29a7923c301b6f55b2377 [53/62] spi: bcm2835aux: make the polling duration limits configurable
reproduce:
        # apt-get install sparse
        git checkout 5fd917afc4bfe77686a29a7923c301b6f55b2377
        make ARCH=x86_64 allmodconfig
        make C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__'


sparse warnings: (new ones prefixed by >>)

>> drivers/spi/spi-bcm2835aux.c:40:14: sparse: symbol 'polling_limit_us' was not declared. Should it be static?
   drivers/spi/spi-bcm2835aux.c:123:21: sparse: expression using sizeof(void)
   drivers/spi/spi-bcm2835aux.c:151:17: sparse: expression using sizeof(void)
   drivers/spi/spi-bcm2835aux.c:151:17: sparse: expression using sizeof(void)

Please review and possibly fold the followup patch.

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