py/asmthumb: Fix build for F7 MCUs after recent code refactoring.

py/asmthumb.c

@@ -53,7 +53,7 @@ void asm_thumb_end_pass(asm_thumb_t *as) {
     #if defined(MCU_SERIES_F7)
     if (as->base.pass == MP_ASM_PASS_EMIT) {
         // flush D-cache, so the code emited is stored in memory
-        SCB_CleanDCache_by_Addr((uint32_t*)as->code_base, as->code_size);
+        SCB_CleanDCache_by_Addr((uint32_t*)as->base.code_base, as->base.code_size);
         // invalidate I-cache
         SCB_InvalidateICache();
     }