change unitialized byte values in xlink to 0

src/link/main.c

@@ -26,7 +26,7 @@ enum eBlockType {
 };
 
 SLONG options = 0;
-SLONG fillchar = -1;
+SLONG fillchar = 0;
 enum eOutputType outputtype = OUTPUT_GBROM;
 char temptext[1024];
 char smartlinkstartsymbol[256];