tests: Fix fake uid_wrapper_syscall_valid().
We want to return errno = ENOSYS in uid_wrapper_syscall_va(). However if we do not handle __FAKE_SOCKET_WRAPPER_SYSCALL_NO+1 then we will call libc_syscall() for __FAKE_SOCKET_WRAPPER_SYSCALL_NO+1.
Same problem as resolved for uid_wrapper, see: BUG: https://bugzilla.samba.org/show_bug.cgi?id=15445 BUG: https://bugzilla.samba.org/show_bug.cgi?id=15448
Signed-off-by: Simon Josefsson simon@josefsson.org