off by one.

git-svn-id: http://svn.openzap.org/svn/openzap/trunk@247 a93c3328-9c30-0410-af19-c9cd2b2d52af

libs/freetdm/src/isdn/Q931ie.c

@@ -1029,6 +1029,7 @@ L3INT Q931Uie_Cause(Q931_TrunkInfo_t *pTrunk, Q931mes_Generic *pMsg, L3UCHAR * I
 
     /* Octet 4 */
     pie->Value = IBuf[Octet+Off] & 0x7f;
+    Octet++;
 
     Q931IESizeTest(Q931E_CAUSE);