Fix heap-buffer-overflow
Cast signed char to unsigned char to avoid sprintf doing sign extension for %x. Test: build Bug: 75983919 Merged-In: I6685a77ac1c832d8dd83beafd7e463d56fab77d3 Change-Id: I6685a77ac1c832d8dd83beafd7e463d56fab77d3 (cherry picked from commit 9caabc0c)
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