fix applyQ for GPU in Rsvd_notruncate.cpp

Author: manuschneider

src/linalg/Rsvd_notruncate.cpp

@@ -64,44 +64,30 @@ namespace cytnx {
         cytnx::linalg_internal::lii.Gesvd_ii[in.dtype()](
           in._impl->storage()._impl, U._impl->storage()._impl, vT._impl->storage()._impl,
           S._impl->storage()._impl, in.shape()[0], in.shape()[1]);
-
-        std::vector<Tensor> out;
-        out.push_back(S);
-        if (is_U) {
-          if (applyQ) {
-            U = Matmul(Q, U);
-          }
-          out.push_back(U);
-        }
-        if (is_vT) {
-          out.push_back(vT);
-        }
-
-        return out;
-
       } else {
   #ifdef UNI_GPU
         checkCudaErrors(cudaSetDevice(in.device()));
         cytnx::linalg_internal::lii.cuGeSvd_ii[in.dtype()](
           in._impl->storage()._impl, U._impl->storage()._impl, vT._impl->storage()._impl,
           S._impl->storage()._impl, in.shape()[0], in.shape()[1]);
-
+  #else
+        cytnx_error_msg(true, "[Rsvd] fatal error,%s",
+                        "try to call the gpu section without CUDA support.\n");
+        return std::vector<Tensor>();
+  #endif
         std::vector<Tensor> out;
         out.push_back(S);
         if (is_U) {
-          U = Matmul(Q, U);
+          if (applyQ) {
+            U = Matmul(Q, U);
+          }
           out.push_back(U);
         }
         if (is_vT) {
           out.push_back(vT);
         }
 
         return out;
-  #else
-        cytnx_error_msg(true, "[Rsvd] fatal error,%s",
-                        "try to call the gpu section without CUDA support.\n");
-        return std::vector<Tensor>();
-  #endif
       }
     }  // Rsvd(Tensor)