trusty: ql_tipc: Re-fix random stuck boottests

42d5ab78c61a145d3a6c91564723251fc5b8b43a broke
QL_TIPC_DEV_FC_HAS_EVENT by adding a parameter check that will never
pass.
1. The payload_len passed into this call was 0 since no data was passed
   in.
2. The check compared the payload_len to the return payload_len plus the
   header size which is not part of payload_len.

Remove the check. Alternatively we could check that payload_len is 0,
but I don't know of any client code has been modified to pass in the
incorrect value that the code was checking for.

Bug: 142284039
Change-Id: I22e8910445cff3e1758bd07ad9d619c2ba434a87