[3.15] gh-151126: Fix missing memory errors in _interpretersmodule.c (GH-151624) (#152169)

gh-151126: Fix missing memory errors in `_interpretersmodule.c` (GH-151624)
(cherry picked from commit 05225aa)

Co-authored-by: stevens <lipengyu@kylinos.cn>

Author: miss-islington

Misc/NEWS.d/next/Core_and_Builtins/2026-06-18-16-00-10.gh-issue-151126.tBqn6I.rst

@@ -0,0 +1,3 @@
+Fix a crash when sharing :class:`memoryview` objects between interpreters
+fails due to running out of memory. It now raises a proper
+:exc:`MemoryError`.

Modules/_interpretersmodule.c

@@ -144,15 +144,15 @@ xibufferview_from_buffer(PyTypeObject *cls, Py_buffer *view, int64_t interpid)
 
     Py_buffer *copied = PyMem_RawMalloc(sizeof(Py_buffer));
     if (copied == NULL) {
-        return NULL;
+        return PyErr_NoMemory();
     }
     /* This steals the view->obj reference  */
     *copied = *view;
 
     xibufferview *self = PyObject_Malloc(sizeof(xibufferview));
     if (self == NULL) {
         PyMem_RawFree(copied);
-        return NULL;
+        return PyErr_NoMemory();
     }
     PyObject_Init(&self->base, cls);
     *self = (xibufferview){
@@ -277,6 +277,7 @@ _pybuffer_shared(PyThreadState *tstate, PyObject *obj, _PyXIData_t *data)
 {
     struct xibuffer *view = PyMem_RawMalloc(sizeof(struct xibuffer));
     if (view == NULL) {
+        PyErr_NoMemory();
         return -1;
     }
     view->used = 0;