py/persistentcode: Initialize prelude_ptr to prevent compiler warning.

IhorNehrutsa · DvdGiessen · dpgeorge · commit a4ab84768840 · 2025-01-24T23:17:05.000+11:00
The esp32 IDF toolchain can give a "may be used uninitialized" warning, at
least for ESP32-S3 with gcc 14.2.0.  Silence that warning by initializing
the variable with NULL.

Co-authored-by: Daniel van de Giessen &lt;daniel@dvdgiessen.nl&gt;
Signed-off-by: IhorNehrutsa &lt;Ihor.Nehrutsa@gmail.com&gt;
diff --git a/py/persistentcode.c b/py/persistentcode.c
@@ -402,7 +402,7 @@ static mp_raw_code_t *load_raw_code(mp_reader_t *reader, mp_module_context_t *co
 
     #if MICROPY_EMIT_MACHINE_CODE
     } else {
-        const uint8_t *prelude_ptr;
+        const uint8_t *prelude_ptr = NULL;
         #if MICROPY_EMIT_NATIVE_PRELUDE_SEPARATE_FROM_MACHINE_CODE
         if (kind == MP_CODE_NATIVE_PY) {
             // Executable code cannot be accessed byte-wise on this architecture, so copy
