Apple / iOS build compatability patch

This allows build on iOS platform, thanks Darin!

Signed-off-by: Darin Willits <darin@willits.ca>
diff --git a/lib/client-handshake.c b/lib/client-handshake.c
index df91923..8c821ef 100644
--- a/lib/client-handshake.c
+++ b/lib/client-handshake.c
@@ -79,6 +79,8 @@
 		return NULL;
 	}
 
+	memset(wsi, 0, sizeof *wsi);
+
 	/* -1 means just use latest supported */
 
 	if (ietf_version_or_minus_one == -1)