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Add function to typecast s8 to u8 in safe way. This function throws an error if operand is more than CHAR_MAX. JIRA NVGPU-3432 JIRA NVGPU-3438 Change-Id: Ieb712e6bcf187d6f26aaa1f2e0d8e6d2a17bcc54 Signed-off-by: Vaibhav Kachore <vkachore@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/2124258 Reviewed-by: Deepak Nibade <dnibade@nvidia.com> GVS: Gerrit_Virtual_Submit Reviewed-by: Alex Waterman <alexw@nvidia.com> Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com> Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>