zocl populate_slot_specific_sec fails to clean up on error

[kiwichris]

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In populate_slot_specific_sec memory allocated in the section reads is not freed if there is an error:

https://github.com/Xilinx/XRT/blob/master/src/runtime_src/core/edge/drm/zocl/zocl_xclbin.c#L1164

Should it?