amdgpu fails compilation with CONFIG_FORTIFY_SOURCE

[Ján Kosterec]

amdgpu driver fails compilation when compiling with
CONFIG_FORTIFY_SOURCE kernel option:

In function ‘memmove’,
    inlined from ‘append_entry’ at
drivers/gpu/drm/amd/amdgpu/../display/dc/basics/logger.c:258:2,
    inlined from ‘dm_logger_append_va.part.5’ at
drivers/gpu/drm/amd/amdgpu/../display/dc/basics/logger.c:349:4:
./include/linux/string.h:356:4: error: call to ‘__read_overflow2’
declared with attribute error: detected read beyond size of object
passed as 2nd parameter
    __read_overflow2();
    ^~~~~~~~~~~~~~~~~~

I have attached a patch which resolves this problem.

Regards,
Jan
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