Various updates to spandsp tests

spandsp logging now passes an opaque pointer to the logging routine, to
increase flexibility. Right now the pointer is set to NULL in all calls.

libs/spandsp/src/queue.c

@@ -188,7 +188,6 @@ SPAN_DECLARE(int) queue_read(queue_state_t *s, uint8_t *buf, int len)
 SPAN_DECLARE(int) queue_read_byte(queue_state_t *s)
 {
     int real_len;
-    int to_end;
     int iptr;
     int optr;
     int byte;
@@ -202,7 +201,6 @@ SPAN_DECLARE(int) queue_read_byte(queue_state_t *s)
     if (real_len < 1)
         return -1;
     /*endif*/
-    to_end = s->len - optr;
     byte = s->data[optr];
     if (++optr >= s->len)
         optr = 0;