Support FFARPC call requests with no shared buffer

To allow simple clients to make RPC calls for service operations
that take no request parameters and return no response parameters,
the ffarpc_call_ep.c has been modified to accept call requests
when no shared buffer exists, as long as there is no request data.

Signed-off-by: Julian Hall <julian.hall@arm.com>
Change-Id: I83b1bfb719a005922d6394887492d2d272b74907
1 file changed