llama : check returned fn ptrs from ggml_backend_reg_get_proc_address #15893
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This commit adds check for two function pointers returned from ggml_backend_reg_get_proc_address.
The motivation for this is that the function pointer could be nullptr if the get proc address function changes in the future. This is also consistent with all the other calls to ggml_backend_reg_get_proc_address in the code base.