Hi Jesper,

I love your patch! Perhaps something to improve:

[auto build test WARNING on bpf/master]

url:    https://github.com/0day-ci/linux/commits/Jesper-Dangaard-Brouer/bpf-avoid-using-returning-file-descriptor-value-zero/20200609-005457
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git master
config: i386-randconfig-s001-20200609 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-13) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.1-247-gcadbd124-dirty
        # save the attached .config to linux build tree
        make W=1 C=1 ARCH=i386 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__'

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>


sparse warnings: (new ones prefixed by >>)

>> kernel/bpf/syscall.c:692:5: sparse: sparse: symbol 'bpf_anon_inode_getfd' was not declared. Should it be static?

Please review and possibly fold the followup patch.

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0-DAY CI Kernel Test Service, Intel Corporation
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