pan/decode: Ensure mappings are zeroed

Fixes valgrind error when running with =sync

==30966== Conditional jump or move depends on uninitialised value(s)
==30966==    at 0x5B424E8: pandecode_find_mapped_gpu_mem_containing (decode_common.c:56)
==30966==    by 0x5B4CFB7: pandecode_jc (decode.c:2075)
==30966==    by 0x5ABBFA7: panfrost_batch_submit_ioctl (pan_job.c:1020)
==30966==    by 0x5ABD397: panfrost_batch_submit_jobs (pan_job.c:1042)
==30966==    by 0x5ABD397: panfrost_batch_submit (pan_job.c:1109)

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7081>
1 file changed