Don't set yk_errno if nothing went wrong

This fixes a superfluous warning when using challenge-response
authentication with yubico-pam on OS X:
	debug: pam_yubico.c:649 (do_challenge_response): USB error: USB error
This warning appeared although no error actually occured.

diff --git a/ykcore/ykcore_osx.c b/ykcore/ykcore_osx.c
index 58e3bd2934476aa5d5392a51865aa8513d4b8ecb..7d343a046a606b70368f56f5c69c42fe82965bb8 100644 (file)
--- a/ykcore/ykcore_osx.c
+++ b/ykcore/ykcore_osx.c
@@ -121,7 +121,8 @@ void *_ykusb_open_device(int vendor_id, int product_id)
                        yk_release();
                        return 0;
                }
-               
+
+               yk_errno = 0;
                return yk;
        }