selftest/net: Remove duplicate header

Remove duplicate header which is included twice.

Signed-off-by: Sabyasachi Gupta <sabyasachi.linux@gmail.com>
Signed-off-by: Souptick Joarder <jrdr.linux@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

tools/testing/selftests/net/udpgso.c

@@ -17,7 +17,6 @@
 #include <stdbool.h>
 #include <stdlib.h>
 #include <stdio.h>
-#include <stdlib.h>
 #include <string.h>
 #include <sys/ioctl.h>
 #include <sys/socket.h>