raw: Convey transmit path errors to the caller.

The transport layer's functional interface foresees having error codes
percolate back up to the caller.  However, up until now, the raw module
simply returned -1 for any error.  This patch lets the code return the
specific error instead.  In addition, it removes the gratuitous printing
of the error message, leaving that task up to caller, just like the other
transport modules.

Signed-off-by: Richard Cochran <richardcochran@gmail.com>

raw.c

@@ -336,8 +336,7 @@ static int raw_send(struct transport *t, struct fdarray *fda,
 
 	cnt = send(fd, ptr, len, 0);
 	if (cnt < 1) {
-		pr_err("send failed: %d %m", errno);
-		return cnt;
+		return -errno;
 	}
 	/*
 	 * Get the time stamp right away.