selftest/net: Remove duplicate header

Remove duplicate header which is included twice.

Signed-off-by: Sabyasachi Gupta <[e-mail]>
Signed-off-by: Souptick Joarder <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

tools/testing/selftests/net/udpgso.c

···
 #include <stdbool.h>
 #include <stdlib.h>
 #include <stdio.h>
-#include <stdlib.h>
 #include <string.h>
 #include <sys/ioctl.h>
 #include <sys/socket.h>