wget: fix bug 1057 "busybox wget segfaults with http_proxy environment set"

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/networking/wget.c b/networking/wget.c
index 2b9ba55..5b73b93 100644
--- a/networking/wget.c
+++ b/networking/wget.c
@@ -592,6 +592,7 @@
 	if (use_proxy) {
 		proxy = getenv(target.is_ftp ? "ftp_proxy" : "http_proxy");
 		if (proxy && proxy[0]) {
+			server.user = NULL;
 			parse_url(proxy, &server);
 		} else {
 			use_proxy = 0;