testdisplay: Make sure readlink() result is nul-terminated
A similar fix as in commit a7001318 ("tests/tools_test: Use readlink() properly"), zero-initialize and read sizeof minus one. Signed-off-by:Petri Latvala <petri.latvala@intel.com> Cc: Arkadiusz Hiler <arkadiusz.hiler@intel.com> Reviewed-by:
Arkadiusz Hiler <arkadiusz.hiler@intel.com>
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