rusticl/disk_cache: fix stack corruption
The length passed to mesa_bytes_to_hex is the one of the input, not output data.
Fixes: fbe9a7ca ("rusticl/mesa: create proper build-id hash for the disk cache")
The length passed to mesa_bytes_to_hex is the one of the input, not output data.
Fixes: fbe9a7ca ("rusticl/mesa: create proper build-id hash for the disk cache")