static_build: fix bss initialization

Author: facchinm

cores/arduino/main.cpp

@@ -95,7 +95,7 @@ extern "C" __attribute__((section(".entry_point"), used)) void entry_point(struc
   printk("Sketch Heap start: %p, size %p\n", &kheap_llext_heap, &kheap_llext_heap_size);
 
   memcpy(&_sdata, &_sidata, (&_edata - &_sdata) * sizeof(uint32_t));
-  memset(&_sbss, 0, &_ebss - &_sbss);
+  memset(&_sbss, 0, (&_ebss - &_sbss) * sizeof(uint32_t));
   __libc_init_array();
   main();
 }