net: strange: needed to prevent failutre

I don't know why, but without this the next commit fails with a bad
assert error in the compiler.

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

lib/ipv4.c

@@ -20,7 +20,7 @@
 #define htons(x) x
 #endif
 
-int needIP;
+int needIP = 1;
 static uint8_t myIP[4];
 
 /* bootp: bigger buffer, UDP based */
@@ -73,9 +73,6 @@ void ipv4_init(void)
 {
 	struct wr_sockaddr saddr;
 
-	/* Reset => need a fresh IP */
-	needIP = 1;
-
 	/* Bootp: use UDP engine activated but function arguments  */
 	bootp_socket = ptpd_netif_create_socket(&__static_bootp_socket, NULL,
 						PTPD_SOCK_UDP, 68 /* bootpc */);