fb_set_fci_length
Description:
Set the length of the Feedback Control Information attached to a RTPFB or PSFB this.
Parameters:
| this | 
           a valid RTPFB or PSFB Packet  | 
      
| wordlen | 
           Length of the FCI in 32-bit words  | 
      
Returns:
| 
           true if there was enough space in the packet to add this much FCI  |