initialise buffer.device in ggml_hexagon_session (#16816)

ggml/src/ggml-hexagon/ggml-hexagon.cpp

@@ -211,7 +211,7 @@ static inline void hex_format_op_names(char * str, const struct ggml_tensor * t)
 // ** backend sessions
 
 struct ggml_hexagon_session {
-    ggml_hexagon_session(int dev_id) noexcept(false);
+    ggml_hexagon_session(int dev_id, ggml_backend_dev_t dev) noexcept(false);
     ~ggml_hexagon_session() noexcept(true);
 
     void allocate(int dev_id) noexcept(false);
@@ -1631,10 +1631,13 @@ void ggml_hexagon_session::release() noexcept(true) {
     }
 }
 
-ggml_hexagon_session::ggml_hexagon_session(int dev_id) noexcept(false) {
+ggml_hexagon_session::ggml_hexagon_session(int dev_id, ggml_backend_dev_t dev) noexcept(false) {
     buffer_type.context        = nullptr;
     repack_buffer_type.context = nullptr;
 
+    buffer_type.device         = dev;
+    repack_buffer_type.device  = dev;
+
     try {
         allocate(dev_id);
 
@@ -3628,7 +3631,7 @@ ggml_hexagon_registry::ggml_hexagon_registry(ggml_backend_reg_t reg) {
         devices[i].iface   = ggml_backend_hexagon_device_i;
         devices[i].reg     = reg;
         try {
-            devices[i].context = new ggml_hexagon_session(i);
+            devices[i].context = new ggml_hexagon_session(i, &devices[i]);
         } catch (std::exception const &exc) {
             GGML_LOG_ERROR("ggml-hex: failed to create device/session %zu\n", i);
             devices[i].context = nullptr;