pdch: Log line detaching TBF at start of the function

Log before the action is done ("Detaching", not "Detached"). This way,
if something crashes we see that last line.

Change-Id: I6811d3772e2ac850741d3db5ec32be5c0812e81a
diff --git a/tests/app_info/AppInfoTest.err b/tests/app_info/AppInfoTest.err
index a8c4511..d39e952 100644
--- a/tests/app_info/AppInfoTest.err
+++ b/tests/app_info/AppInfoTest.err
@@ -52,14 +52,14 @@
 Sending Packet Application Information to 2 subscribers with active TBF
 
 --- cleanup ---
-PDCH(bts=0,trx=0,ts=4) Detaching TBF(TFI=0 TLLI=0xffffffff DIR=DL STATE=NEW EGPRS), 1 TBFs, USFs = 00, TFIs = 00000002.
-PDCH(bts=0,trx=0,ts=5) Detaching TBF(TFI=0 TLLI=0xffffffff DIR=DL STATE=NEW EGPRS), 1 TBFs, USFs = 00, TFIs = 00000002.
-PDCH(bts=0,trx=0,ts=6) Detaching TBF(TFI=0 TLLI=0xffffffff DIR=DL STATE=NEW EGPRS), 1 TBFs, USFs = 00, TFIs = 00000002.
-PDCH(bts=0,trx=0,ts=7) Detaching TBF(TFI=0 TLLI=0xffffffff DIR=DL STATE=NEW EGPRS), 0 TBFs, USFs = 00, TFIs = 00000000.
+PDCH(bts=0,trx=0,ts=4) Detaching TBF(TFI=0 TLLI=0xffffffff DIR=DL STATE=NEW EGPRS), 2 TBFs, USFs = 00, TFIs = 00000003.
+PDCH(bts=0,trx=0,ts=5) Detaching TBF(TFI=0 TLLI=0xffffffff DIR=DL STATE=NEW EGPRS), 2 TBFs, USFs = 00, TFIs = 00000003.
+PDCH(bts=0,trx=0,ts=6) Detaching TBF(TFI=0 TLLI=0xffffffff DIR=DL STATE=NEW EGPRS), 2 TBFs, USFs = 00, TFIs = 00000003.
+PDCH(bts=0,trx=0,ts=7) Detaching TBF(TFI=0 TLLI=0xffffffff DIR=DL STATE=NEW EGPRS), 1 TBFs, USFs = 00, TFIs = 00000001.
 MS(TLLI=0xffffffff, IMSI=, TA=220, 10/11,) Detaching TBF: TBF(TFI=0 TLLI=0xffffffff DIR=DL STATE=NEW EGPRS)
-PDCH(bts=0,trx=0,ts=4) Detaching TBF(TFI=1 TLLI=0xffffffff DIR=DL STATE=NEW EGPRS), 0 TBFs, USFs = 00, TFIs = 00000000.
-PDCH(bts=0,trx=0,ts=5) Detaching TBF(TFI=1 TLLI=0xffffffff DIR=DL STATE=NEW EGPRS), 0 TBFs, USFs = 00, TFIs = 00000000.
-PDCH(bts=0,trx=0,ts=6) Detaching TBF(TFI=1 TLLI=0xffffffff DIR=DL STATE=NEW EGPRS), 0 TBFs, USFs = 00, TFIs = 00000000.
+PDCH(bts=0,trx=0,ts=4) Detaching TBF(TFI=1 TLLI=0xffffffff DIR=DL STATE=NEW EGPRS), 1 TBFs, USFs = 00, TFIs = 00000002.
+PDCH(bts=0,trx=0,ts=5) Detaching TBF(TFI=1 TLLI=0xffffffff DIR=DL STATE=NEW EGPRS), 1 TBFs, USFs = 00, TFIs = 00000002.
+PDCH(bts=0,trx=0,ts=6) Detaching TBF(TFI=1 TLLI=0xffffffff DIR=DL STATE=NEW EGPRS), 1 TBFs, USFs = 00, TFIs = 00000002.
 MS(TLLI=0xffffffff, IMSI=, TA=220, 12/13,) Detaching TBF: TBF(TFI=1 TLLI=0xffffffff DIR=DL STATE=NEW EGPRS)
 MS(TLLI=0xffffffff, IMSI=, TA=220, 12/13,) Destroying MS object
 MS(TLLI=0xffffffff, IMSI=, TA=220, 10/11,) Destroying MS object