fix up annoying signed/unsigned and mixed type errors
diff --git a/networking/wget.c b/networking/wget.c
index 9c7ed9f..6c6a8a7 100644
--- a/networking/wget.c
+++ b/networking/wget.c
@@ -332,11 +332,11 @@
 #ifdef CONFIG_FEATURE_WGET_AUTHENTICATION
 			if (target.user) {
 				fprintf(sfp, "Authorization: Basic %s\r\n",
-					base64enc(target.user, buf, sizeof(buf)));
+					base64enc((unsigned char*)target.user, buf, sizeof(buf)));
 			}
 			if (use_proxy && server.user) {
 				fprintf(sfp, "Proxy-Authorization: Basic %s\r\n",
-					base64enc(server.user, buf, sizeof(buf)));
+					base64enc((unsigned char*)server.user, buf, sizeof(buf)));
 			}
 #endif