csn1: Remove code block from CSN_NEXT_EXIST_LH

It was removed in wireshark.git e8407dd6c1378427daee77e8de540d0b5f7a0b73
and it's not there anymore in current master.

Change-Id: I73f4eeca3fd4f00a5bc4f06ef7a9bb9b8a70e37b

src/csn1.c

@@ -1027,12 +1027,6 @@ csnStreamDecoder(csnStream_t* ar, const CSN_DESCR* pDescr, struct bitvec *vector
           /* skip 'i' entries + this entry */
           pDescr += pDescr->i + 1;
 
-          /* pDescr now must be pointing to a CSN_END entry, if not this is an error */
-          if ( pDescr->type != CSN_END )
-          { /* substract one more bit from remaining_bits_len to make the "not enough bits" error to be triggered */
-            remaining_bits_len--;
-          }
-
           /* set the data member to "not exist" */
           *pui8 = 0;
           break;