[renesas-drivers:topic/renesas-overlays 18/89] (.text+0x21): multiple definition of `of_changeset_add_property_copy'

[kbuild test robot]

tree:   
https://git.kernel.org/pub/scm/linux/kernel/git/geert/renesas-drivers.git 
topic/renesas-overlays
head:   a1cbc059d0a208214bf7f30d522f2b642ba1a928
commit: 238a29fd337541df2445f9768a551e47ea81c572 [18/89] of: changesets: 
Introduce changeset helper methods
config: i386-tinyconfig (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        git checkout 238a29fd337541df2445f9768a551e47ea81c572
        # save the attached .config to linux build tree
        make ARCH=i386 

Note: the renesas-drivers/topic/renesas-overlays HEAD 
a1cbc059d0a208214bf7f30d522f2b642ba1a928 builds fine.
      It only hurts bisectibility.

All errors (new ones prefixed by >>):

   init/mounts.o: In function `of_changeset_add_property_copy':
>> (.text+0x21): multiple definition of `of_changeset_add_property_copy'
   init/main.o:main.c:(.text+0x19): first defined here
   init/mounts.o: In function `of_changeset_add_property_string':
>> (.text+0x27): multiple definition of `of_changeset_add_property_string'
   init/main.o:main.c:(.text+0x1f): first defined here

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