cgo: generate correct multiple return value function invocations
cgo: generate correct multiple return value function invocations

Fixes issue 967.

R=rsc
CC=golang-dev
http://codereview.appspot.com/1855051

Committer: Russ Cox <5ad239cb8a44f659eaaee0aa1ea5b94947abe557@golang.org>

d0f/go-zh,npe9/noahevans-go9,glycerine/jeaten-go-arrayof-structof,Triskite/willstone-goclone,npe9/noahevans-go9,rdp/rogerpack2005-golang,scirelli/scirelli-go,mhennings/marcohennings-go,Triskite/willstone-goclone,npe9/noahevans-go9,webfd/go-zh,webfd/go-zh,sanjosh/sanjos100-tipc,scirelli/scirelli-go,webfd/go-zh,rflanagan/reginaldflanagan-project1,bryanxu/go-zh,glycerine/jeaten-go-arrayof-structof,bryanxu/go-zh,npe9/noahevans-go9,rdp/rogerpack2005-golang,webfd/go-zh,rflanagan/reginaldflanagan-project1,rflanagan/reginaldflanagan-project1,glycerine/jeaten-go-arrayof-structof,d0f/go-zh,mhennings/marcohennings-go,sanjosh/sanjos100-tipc,sanjosh/sanjos100-tipc,rdp/rogerpack2005-golang,d0f/go-zh,mhennings/marcohennings-go,rflanagan/reginaldflanagan-project1,sanjosh/sanjos100-tipc,bryanxu/go-zh,rflanagan/reginaldflanagan-project1,glycerine/jeaten-go-arrayof-structof,sanjosh/sanjos100-tipc,Triskite/willstone-goclone,mhennings/marcohennings-go,Triskite/willstone-goclone,Triskite/willstone-goclone,rflanagan/reginaldflanagan-project1,d0f/go-zh,bryanxu/go-zh,webfd/go-zh,rflanagan/reginaldflanagan-project1,mhennings/marcohennings-go,webfd/go-zh,npe9/noahevans-go9,d0f/go-zh,scirelli/scirelli-go,glycerine/jeaten-go-arrayof-structof,glycerine/jeaten-go-arrayof-structof,bryanxu/go-zh,rdp/rogerpack2005-golang,rflanagan/reginaldflanagan-project1,mhennings/marcohennings-go,Triskite/willstone-goclone,npe9/noahevans-go9,scirelli/scirelli-go,bryanxu/go-zh,bryanxu/go-zh,d0f/go-zh,scirelli/scirelli-go,rdp/rogerpack2005-golang,npe9/noahevans-go9,sanjosh/sanjos100-tipc,Triskite/willstone-goclone,rdp/rogerpack2005-golang,glycerine/jeaten-go-arrayof-structof,webfd/go-zh,bryanxu/go-zh,scirelli/scirelli-go,sanjosh/sanjos100-tipc,mhennings/marcohennings-go,sanjosh/sanjos100-tipc,mhennings/marcohennings-go,rdp/rogerpack2005-golang,npe9/noahevans-go9,glycerine/jeaten-go-arrayof-structof,Triskite/willstone-goclone,d0f/go-zh,webfd/go-zh,scirelli/scirelli-go,scirelli/scirelli-go,d0f/go-zh,rdp/rogerpack2005-golang