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opencl: bugfix increment ref_count in ggml_backend_opencl_init()
Incrementing `ref_count` at the beginning is important later in the `free()` method of the `ggml_backend_opencl_context` at program end. If we do not increment the `ref_count`, the result would be -1 here, and consequently, the profiling data would not be flushed and written. ( #ifdef GGML_OPENCL_PROFILING )
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‎ggml/src/ggml-opencl/ggml-opencl.cpp‎

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@@ -7495,6 +7495,7 @@ static ggml_backend_i ggml_backend_opencl_i = {
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ggml_backend_t ggml_backend_opencl_init(void) {
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ggml_backend_dev_t dev = ggml_backend_reg_dev_get(ggml_backend_opencl_reg(), 0);
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ggml_backend_opencl_context *backend_ctx = ggml_cl_init(dev);
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backend_ctx->ref_count++;
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ggml_backend_t backend = new ggml_backend {
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/* .guid = */ ggml_backend_opencl_guid(),

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