[3.15] gh-151126: Add missing PyErr_NoMemory() in type_from_slots_or_spec (GH-151582) (#152016)

(cherry picked from commit 7928a8b)

Co-authored-by: Ivy Xu <fakeshadow1337@gmail.com>
Co-authored-by: Stan Ulbrych <stan@python.org>

Author: 3 people

Misc/ACKS

@@ -2144,6 +2144,7 @@ Xiang Zhang
 Robert Xiao
 Florent Xicluna
 Yanbo, Xie
+Ivy Xu
 Kaisheng Xu
 Xinhang Xu
 Arnon Yaari

Objects/typeobject.c

@@ -5488,6 +5488,7 @@ type_from_slots_or_spec(
     Py_ssize_t name_buf_len = strlen(it.name) + 1;
     _ht_tpname = PyMem_Malloc(name_buf_len);
     if (_ht_tpname == NULL) {
+        PyErr_NoMemory();
         goto finally;
     }
     memcpy(_ht_tpname, it.name, name_buf_len);
@@ -5774,7 +5775,7 @@ type_from_slots_or_spec(
     ((PyObject*)type)->ob_flags |= _Py_TYPE_REVEALED_FLAG;
 #endif
 
- finally:
+finally:
     if (PyErr_Occurred()) {
         Py_CLEAR(res);
     }