modified destructors to query capsules's Name

Author: oleksandr-pavlyk

include/pybind11/pytypes.h

@@ -1588,7 +1588,7 @@ class capsule : public object {
                 }
                 pybind11_fail("Unable to get capsule context");
             }
-            void *ptr = PyCapsule_GetPointer(o, nullptr);
+            void *ptr = PyCapsule_GetPointer(o, PyCapsule_GetName(o));
             if (ptr == nullptr) {
                 throw error_already_set();
             }
@@ -1602,7 +1602,7 @@ class capsule : public object {
 
     explicit capsule(void (*destructor)()) {
         m_ptr = PyCapsule_New(reinterpret_cast<void *>(destructor), nullptr, [](PyObject *o) {
-            auto destructor = reinterpret_cast<void (*)()>(PyCapsule_GetPointer(o, nullptr));
+	    auto destructor = reinterpret_cast<void (*)()>(PyCapsule_GetPointer(o, PyCapsule_GetName(o)));
             if (destructor == nullptr) {
                 throw error_already_set();
             }
@@ -1640,7 +1640,7 @@ class capsule : public object {
     const char *name() const { return PyCapsule_GetName(m_ptr); }
 
     /// Replaces a capsule's name *without* calling the destructor on the existing one.
-    void set_name(const char * &new_name) {
+    void set_name(const char *&new_name) {
         if (PyCapsule_SetName(m_ptr, new_name) != 0) {
             throw error_already_set();
         }