simplify

Author: stduhpf

tools/mtmd/clip.cpp

@@ -385,14 +385,14 @@ struct clip_ctx {
             throw std::runtime_error("failed to initialize CPU backend");
         }
         backend = nullptr;
-        auto backend_name = std::getenv("MTMD_BACKEND_DEVICE");
-        if(backend_name != nullptr && ctx_params.use_gpu) {
-            backend = ggml_backend_init_by_name(backend_name, nullptr);
-        }
-        if(!backend){
-            backend = ctx_params.use_gpu
-                        ? ggml_backend_init_by_type(GGML_BACKEND_DEVICE_TYPE_GPU, nullptr)
-                        : nullptr;
+        if(ctx_params.use_gpu) {
+            auto backend_name = std::getenv("MTMD_BACKEND_DEVICE");
+            if(backend_name != nullptr) {
+                backend = ggml_backend_init_by_name(backend_name, nullptr);
+            }
+            if(!backend){
+                backend = ggml_backend_init_by_type(GGML_BACKEND_DEVICE_TYPE_GPU, nullptr);
+            }
         }
 
         if (backend) {