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Try to free only allocated buffers in gr_gk20a_free_global_ctx_buffers(), otherwise the destroy function pointer would be NULL and crash for nonallocated buffers. This can happen when init fails for some of the buffers. Additionally, make the pointer NULL when a buffer is destroyed, to signify this state. Also refactor the function upwards and call it from gr_gk20a_alloc_global_ctx_buffers() to reduce code duplication. Change-Id: I6e74795014f5e315b5f8342f544ddfccc0d02b71 Signed-off-by: Konsta Holtta <kholtta@nvidia.com> Reviewed-on: http://git-master/r/1126026 Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com> Tested-by: Terje Bergstrom <tbergstrom@nvidia.com>