opencl : fix profile-related errors (#12095)

Co-authored-by: ubuntu <ubuntu@localhost.localdomain>

ggml/src/ggml-opencl/ggml-opencl.cpp

@@ -278,7 +278,7 @@ static ggml_backend_opencl_context * ggml_cl2_init(ggml_backend_dev_t dev) {
 
     cl_int err;
 
-#ifdef GGML_PROFILE_OPENCL
+#ifdef GGML_OPENCL_PROFILING
     GGML_LOG_INFO("ggml_opencl: OpenCL profiling enabled\n");
 #endif
 
@@ -3023,6 +3023,7 @@ static void ggml_cl_mul_mat(ggml_backend_t backend, const ggml_tensor * src0, co
         // enqueue kernel with profiling
         // <--------------------------------------------> //
     #ifdef GGML_OPENCL_PROFILING
+        cl_event evt;
         CL_CHECK(clEnqueueNDRangeKernel(queue, kernel, 3, NULL, global_work_size, local_work_size, 0, NULL, &evt));
 
         g_profiling_info.emplace_back();