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Fix CERT issue in nvgpu_gr_falcon_bind_fecs_elpg where nvgpu_pmu_pg_buf could return NULL. nvgpu_pmu_pg_buf is called from context where PG will be enabled hence remove the NULL return logic as it is dead code. Replace nvgpu_pmu_pg_buf and nvgpu_pmu_pg_buf_get_cpu_va functions by new function nvgpu_pmu_pg_buf_alloc. CID 17860 Bug 3512546 Change-Id: I09820a966dadeb258167ce1433ca256f94845896 Signed-off-by: Sagar Kamble <skamble@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2692466 Tested-by: mobile promotions <svcmobile_promotions@nvidia.com> Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>