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libauth: dont print blobs in auth_proxy error strings

--- a/sys/src/libauth/auth_proxy.c

+++ b/sys/src/libauth/auth_proxy.c

@@ -163,14 +163,15 @@

 				m = read(fd, buf + n, m - n);

 				if(m <= 0){

 					if(m == 0)

-						werrstr("auth_proxy short read: %s",

-							buf);

+						werrstr("auth_proxy short read");

+					else

+						werrstr("auth_proxy read fd: %r");

 					goto Error;

 				}

 				n += m;

 			}

 			if(ret != ARok){

-				werrstr("auth_proxy rpc write: %s: %r", buf);

+				werrstr("auth_proxy rpc write: %r");

 				goto Error;

 			}

 			break;