s390/qdio: use get_buf_state() in debug_get_buf_state()

For a 1-SBAL state inspection, use the corresponding helper.
No functional change, just reducing the number of immediate callers to
get_buf_states().

Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Reviewed-by: Jens Remus <jremus@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

drivers/s390/cio/qdio_main.c

@@ -382,7 +382,7 @@ int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr,
 {
 	if (need_siga_sync(q))
 		qdio_siga_sync_q(q);
-	return get_buf_states(q, bufnr, state, 1, 0, 0);
+	return get_buf_state(q, bufnr, state, 0);
 }
 
 static inline void qdio_stop_polling(struct qdio_q *q)