Revert "tbf: Add GprsMs* argument to update() and use it in reuse_tbf"

This reverts commit 2272a83a13b57ea7e99fe96ac76e4ad892e19e90.

The modification is no longer needed, since the call to update has
been removed from reuse_tbf().

Conflicts:
	src/tbf_dl.cpp

Sponsored-by: On-Waves ehf
diff --git a/src/tbf.h b/src/tbf.h
index f6f13f7..7f1dd76 100644
--- a/src/tbf.h
+++ b/src/tbf.h
@@ -131,7 +131,7 @@
 
 	int rlcmac_diag();
 
-	int update(GprsMs *ms = NULL);
+	int update();
 	void handle_timeout();
 	void stop_timer();
 	void stop_t3191();