avoid reading unallocated memory when argc == 0 (closes #22633)

Python/frozenmain.c

@@ -24,12 +24,14 @@ Py_FrozenMain(int argc, char **argv)
     /* We need a second copies, as Python might modify the first one. */
     wchar_t **argv_copy2 = NULL;
 
+    if (argc > 0) {
         argv_copy = PyMem_RawMalloc(sizeof(wchar_t*) * argc);
         argv_copy2 = PyMem_RawMalloc(sizeof(wchar_t*) * argc);
         if (!argv_copy || !argv_copy2) {
             fprintf(stderr, "out of memory\n");
             goto error;
         }
+    }
 
     Py_FrozenFlag = 1; /* Suppress errors from getpath.c */
 
@@ -68,6 +70,7 @@ Py_FrozenMain(int argc, char **argv)
 #ifdef MS_WINDOWS
     PyInitFrozenExtensions();
 #endif /* MS_WINDOWS */
+    if (argc >= 1)
         Py_SetProgramName(argv_copy[0]);
     Py_Initialize();
 #ifdef MS_WINDOWS