selftests: net: cmsg_sender: Fix spelling mistake "MONOTINIC" -> "MONOTONIC"

There is a spelling mistake in an error message. Fix it.
Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

tools/testing/selftests/net/cmsg_sender.c

@@ -341,7 +341,7 @@ int main(int argc, char *argv[])
 	if (clock_gettime(CLOCK_REALTIME, &time_start_real))
 		error(ERN_GETTIME, errno, "gettime REALTIME");
 	if (clock_gettime(CLOCK_MONOTONIC, &time_start_mono))
-		error(ERN_GETTIME, errno, "gettime MONOTINIC");
+		error(ERN_GETTIME, errno, "gettime MONOTONIC");
 
 	iov[0].iov_base = buf;
 	iov[0].iov_len = sizeof(buf);