[3.14] gh-149983: Fix PyErr_NoMemory call without GIL in winconsoleio.c (GH-149984) (GH-150111)

(cherry picked from commit 3d2aa89)

Co-authored-by: AN Long <aisk@users.noreply.github.com>

Author: miss-islington

Modules/_io/winconsoleio.c

@@ -673,12 +673,13 @@ read_console_w(HANDLE handle, DWORD maxlen, DWORD *readlen) {
             maxlen += 1;
             Py_BLOCK_THREADS
             newbuf = (wchar_t*)PyMem_Realloc(buf, maxlen * sizeof(wchar_t));
-            Py_UNBLOCK_THREADS
             if (!newbuf) {
                 sig = -1;
                 PyErr_NoMemory();
+                Py_UNBLOCK_THREADS
                 break;
             }
+            Py_UNBLOCK_THREADS
             buf = newbuf;
             /* Only advance by n and not BUFSIZ in this case */
             off += n;