of: fix unittest build without CONFIG_OF_OVERLAY
We get a link error when the new tests are used by overlays are not: drivers/of/built-in.o: In function `unflatten_device_tree': (.init.text+0x967): undefined reference to `unittest_unflatten_overlay_base' This makes the #ifdef check match the symbols that lead to building the unittest_unflatten_overlay_base function. Fixes: 81d0848f ("of: Add unit tests for applying overlays") Signed-off-by: Arnd Bergmann <arnd@arndb.de> Reviewed-by: Frank Rowand <frank.rowand@sony.com> Tested-by: Frank Rowand <frank.rowand@sony.com> Signed-off-by: Rob Herring <robh@kernel.org>
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