Replace all occurences of exit() in potential library code

by appropriate return values.


git-svn-id: svn://svn.savannah.nongnu.org/avrdude/trunk/avrdude@1301 81a1dc3b-b13d-400b-aceb-764788c761c2

ft245r.c

@@ -171,7 +171,6 @@ static void add_to_buf (unsigned char c) {
 
     if (nh == tail) {
         fprintf (stderr, "buffer overflow. Cannot happen!\n");
-        //exit (1);
     }
     buffer[head] = c;
     head = nh;