Fix minor code style issue in channel_write
diff --git a/serial/proxy.c b/serial/proxy.c
index d545e36..de6db41 100644
--- a/serial/proxy.c
+++ b/serial/proxy.c
@@ -211,7 +211,6 @@
 	wbytes = 0;
 	while (wbytes < size) {
 		written = write(fd, buf + wbytes, size - wbytes);
-
 		if (written < 0)
 			return -errno;