netstat: avoid returning uninitialized value in p_sockaddr().

In the case the width is less than 0, we are returning an uninitialized
value. For practical purposes the return value is ignored but initialize
it to avoid trouble.

CID:	1341619

usr.bin/netstat/route.c

@@ -417,6 +417,7 @@ p_sockaddr(const char *name, struct sockaddr *sa, struct sockaddr *mask,
 	if (width < 0) {
 		snprintf(buf, sizeof(buf), "{:%s/%%s} ", name);
 		xo_emit(buf, cp);
+		protrusion = 0;
 	} else {
 		if (Wflag != 0 || numeric_addr) {
 			snprintf(buf, sizeof(buf), "{[:%d}{:%s/%%s}{]:} ",