lib: Fix an endless loop when saving SREC files

src/lib/srec.c

···
 /*****************************************************************************
  * File name:   src/lib/srec.c                                               *
  * Created:     2005-03-28 by Hampa Hug <[e-mail]>                     *
- * Copyright:   (C) 2005-2009 Hampa Hug <[e-mail]>                     *
+ * Copyright:   (C) 2005-2013 Hampa Hug <[e-mail]>                     *
  *****************************************************************************/
 
 /*****************************************************************************
···
 	unsigned i;
 	record_t rec;
 
-	while (1) {
+	while (size > 0) {
 		rec.cnt = (size < 16) ? size : 16;
 
 		if (base & 0xff000000) {