fix regression in support for resolv.conf attempts option

commit d6cb08bcaca4ff1f921375510ca72bccea969c75 moved the code and
introduced an incorrect string offset for the new parsing, probably
due to a copy-and-paste error.

patch by Stefan Sedich.

src/network/resolvconf.c

@@ -45,8 +45,8 @@ int __get_resolv_conf(struct resolvconf *conf, char *search, size_t search_sz)
 				if (z != p) conf->ndots = x > 15 ? 15 : x;
 			}
 			p = strstr(line, "attempts:");
-			if (p && isdigit(p[6])) {
-				p += 6;
+			if (p && isdigit(p[9])) {
+				p += 9;
 				unsigned long x = strtoul(p, &z, 10);
 				if (z != p) conf->attempts = x > 10 ? 10 : x;
 			}