tbf: Set m_created_ts in constructor

This way the timestamp is also set for dummy reject TBFs. For other
TBFs, setup() is called immediatelly after calling the constructor, so
we are fine too.

Change-Id: I2966ec7f3f9161d528a173d94797b72d1398c747
diff --git a/src/tbf.cpp b/src/tbf.cpp
index 2d6139b..4bd87dd 100644
--- a/src/tbf.cpp
+++ b/src/tbf.cpp
@@ -137,6 +137,8 @@
 	m_llc.init();
 
 	m_name_buf[0] = '\0';
+
+	m_created_ts = time(NULL);
 }
 
 
@@ -657,7 +659,6 @@
 	if (ms_mode(m_ms) != GPRS)
 		enable_egprs();
 
-	m_created_ts = time(NULL);
 	/* select algorithm */
 	rc = the_pcu->alloc_algorithm(bts, this, single_slot, use_trx);
 	/* if no resource */