selftests: net: Clean up an unused variable

Address compiler warning:

ip_defrag.c: In function 'send_udp_frags':
ip_defrag.c:206:16: warning: unused variable 'udphdr' [-Wunused-variable]
  struct udphdr udphdr;
                ^~~~~~

Signed-off-by: Jakub Sitnicki <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
1 file changed