iris,i965: propagate error from gen_perf_begin_query to glBeginPerfQueryINTEL
Otherwise, mesa will crash in glEndPerfQueryINTEL because OA BO is NULL.
Note: Only Iris and i965 provide begin_intel_perf_query callback.
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Otherwise, mesa will crash in glEndPerfQueryINTEL because OA BO is NULL.
Note: Only Iris and i965 provide begin_intel_perf_query callback.