[3.14] gh-148484: Fix memory leak of iterator in array.array constructor (GH-148523) (GH-148678)

(cherry picked from commit afde756)

Co-authored-by: Gleb Popov <gvpopov.dev@gmail.com>

Author: miss-islington

Modules/arraymodule.c

@@ -2854,8 +2854,10 @@ array_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
                 len = 0;
 
             a = newarrayobject(type, len, descr);
-            if (a == NULL)
+            if (a == NULL) {
+                Py_XDECREF(it);
                 return NULL;
+            }
 
             if (len > 0 && !array_Check(initial, state)) {
                 Py_ssize_t i;
@@ -2864,11 +2866,13 @@ array_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
                         PySequence_GetItem(initial, i);
                     if (v == NULL) {
                         Py_DECREF(a);
+                        Py_XDECREF(it);
                         return NULL;
                     }
                     if (setarrayitem(a, i, v) != 0) {
                         Py_DECREF(v);
                         Py_DECREF(a);
+                        Py_XDECREF(it);
                         return NULL;
                     }
                     Py_DECREF(v);
@@ -2880,6 +2884,7 @@ array_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
                 v = array_array_frombytes((PyObject *)a, initial);
                 if (v == NULL) {
                     Py_DECREF(a);
+                    Py_XDECREF(it);
                     return NULL;
                 }
                 Py_DECREF(v);
@@ -2890,6 +2895,7 @@ array_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
                     wchar_t *ustr = PyUnicode_AsWideCharString(initial, &n);
                     if (ustr == NULL) {
                         Py_DECREF(a);
+                        Py_XDECREF(it);
                         return NULL;
                     }
 
@@ -2910,6 +2916,7 @@ array_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
                     Py_UCS4 *ustr = PyUnicode_AsUCS4Copy(initial);
                     if (ustr == NULL) {
                         Py_DECREF(a);
+                        Py_XDECREF(it);
                         return NULL;
                     }
 
@@ -2937,6 +2944,7 @@ array_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
             return a;
         }
     }
+    Py_XDECREF(it);
     PyErr_SetString(PyExc_ValueError,
         "bad typecode (must be b, B, u, w, h, H, i, I, l, L, q, Q, f or d)");
     return NULL;