network_manager_main: errno is not negative

This looks like it got copied from somewhere. Don't negate the errno,
just return it as-is.

Tested:
    Compiled as expected.

Change-Id: I6b28030bf211d12bacab6b69191406e612a6e45f
Signed-off-by: William A. Kennington III <wak@google.com>
1 file changed