malloc -> calloc

src/ota_mcxn.c

@@ -150,7 +150,7 @@ fwxit:
 
 // try to swap (honor dual image), otherwise just overwrite
 MG_IRAM static void single_bank_swap(char *p1, char *p2, size_t s, size_t ss) {
-  char *tmp = malloc(ss);
+  char *tmp = calloc(1, ss);
   // no stdlib calls here
   for (size_t ofs = 0; ofs < s; ofs += ss) {
     if (tmp != NULL)

src/ota_picosdk.c

@@ -100,7 +100,7 @@ static bool __no_inline_not_in_flash_func(mg_picosdk_write)(void *addr,
 static void __no_inline_not_in_flash_func(single_bank_swap)(char *p1, char *p2,
                                                             size_t s,
                                                             size_t ss) {
-  char *tmp = malloc(ss);
+  char *tmp = calloc(1, ss);
   if (tmp == NULL) return;
 #if PICO_RP2040
   uint32_t xip[256 / sizeof(uint32_t)];