Remove replybuf from gs232a.c as it was not used

rotators/gs232a/gs232a.c

@@ -69,7 +69,6 @@ gs232a_transaction(ROT *rot, const char *cmdstr,
     struct rot_state *rs;
     int retval;
     int retry_read = 0;
-    char replybuf[BUFSZ];
 
     rs = &rot->state;
 
@@ -90,7 +89,6 @@ transaction_write:
     /* If no data requested just return */
     if (!data)
     {
-        data = replybuf;
         return RIG_OK;
     }