fix(ble): write new mac if files does not exist

epicardium/ble/ble.c

@@ -96,7 +96,7 @@ static void setAddress(void)
 
 	int result = fs_read_text_file("mac.txt", buf, sizeof(buf));
 
-	if (result == -1) {
+	if (result < 0) {
 		APP_TRACE_INFO0("mac.txt not found, generating random MAC");
 		epic_trng_read(bdAddr + 3, 3);
 		sprintf(buf,

epicardium/ble/ble_main.c

@@ -333,7 +333,7 @@ static void bleSetup(bleMsg_t *pMsg)
   char buf[32];
   char a, b, c, d, e, f, K;
 
-  if (fs_read_text_file("mac.txt", buf, sizeof(buf)))
+  if (fs_read_text_file("mac.txt", buf, sizeof(buf)) > 0)
   {
     if (sscanf(buf, "%c%c:%c%c:%c%c:%c%c:%c%c:%c%c", &K,&K,&K,&K,&K,&K, &a, &b, &c, &d, &e, &f) == 12)
     {