frontend.c: set SO_PASSCRED to 1 not -1
frontend.c: set SO_PASSCRED to 1 not -1

though it takes an integer boolean so -1 is technically correct.

Signed-off-by: Serge Hallyn <3df611b026e4639bee8aef7a4beb2e39fcebb313@ubuntu.com>

udeved/cgmanager,udeved/cgmanager,lxc/cgmanager,lxc/cgmanager,hallyn/cgmanager,hustcat/cgmanager,hustcat/cgmanager,hallyn/cgmanager-pkg-ubuntu,hallyn/cgmanager,hallyn/cgmanager-pkg-ubuntu