failf() calls should not have newlines in the message string!

lib/connect.c

@@ -284,7 +284,7 @@ static CURLcode bindlocal(struct connectdata *conn,
             failf(data, "Insufficient kernel memory was available: %d", errno);
             break;
           default:
-            failf(data, "errno %d\n", errno);
+            failf(data, "errno %d", errno);
             break;
           } /* end of switch(errno) */