panfrost: Delete debug allocated syncobj.

Fix defect reported by Coverity Scan.

Logically dead code (DEADCODE) dead_error_line: Execution cannot reach this statement: drmSyncobjDestroy(dev->fd, ...

Fixes: 64d6f56a ("panfrost: Allocate syncobjs in panfrost_flush") Signed-off-by: Vinson Lee vlee@freedesktop.org

cc: @alyssa