need to initialize d in some cases.  manifested as missing ethernet.

Reference: /n/atom/patch/applied2013/fsconfip
Date: Mon Aug 26 05:02:22 CES 2013
Signed-off-by: quanstro@quanstro.net

--- /sys/src/fs/port/config.c	Mon Aug 26 05:02:04 2013
+++ /sys/src/fs/port/config.c	Mon Aug 26 05:02:04 2013
@@ -481,6 +481,8 @@
 				goto bad;
 		}else if(astrcmp(word, "ipflag") == 0){
 			uchar *p, d;
+
+			d = 0;
 			if((ipaddr[aindex].modfl&Mflag) == 0)
 				p = &ipaddr[aindex].flag;
 			else