dhcp: stop using magic constants; use (htonl(CONST) != a) - it's smaller

function                                             old     new   delta
udhcp_get_packet                                     146     134     -12
get_raw_packet                                       368     353     -15

diff --git a/networking/udhcp/options.h b/networking/udhcp/options.h
index 5e9adf8..33a968c 100644
--- a/networking/udhcp/options.h
+++ b/networking/udhcp/options.h
@@ -6,7 +6,7 @@
 #define TYPE_MASK	0x0F
 
 enum {
-	OPTION_IP=1,
+	OPTION_IP = 1,
 	OPTION_IP_PAIR,
 	OPTION_STRING,
 #if ENABLE_FEATURE_RFC3397