freedreno/computerator: Fix printf format string.
Fix warning reported by Coverity Scan.
Invalid printf format string (PRINTF_ARGS)
format_error: Flag ' not applicable to conversion specifier in %'lu.
Fixes: 30dd0599250c ("freedreno/computerator: add performance counter support")
Signed-off-by: Vinson Lee <vlee@freedesktop.org>
cc: @robclark