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Calling strncpy with NULL second argument, even when the size is 0, is undefined behavior, which leads to GCC to drop the check old variable with NULL in following code. https://bugzilla.yoctoproject.org/show_bug.cgi?id=6743 (From OE-Core rev: af56e7559d31cb9cb84b85a7dedd8e12cf1f06cd) Signed-off-by: Roy Li <rongqing.li@windriver.com> Signed-off-by: Ross Burton <ross.burton@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>