CLEANUP: httpclient: Remove useless test on ss_dst in httpclient_applet_init()

In httpclient_applet_init() function, ss_dst variable is always defined
before the call to sockaddr_alloc(). There is no reason to test it.

This patch should fix the issue #1706.
diff --git a/src/http_client.c b/src/http_client.c
index 53086a3..160ea1b 100644
--- a/src/http_client.c
+++ b/src/http_client.c
@@ -971,11 +971,6 @@
 		sock_inet_set_port(ss_dst, port);
 	}
 
-	if (!ss_dst) {
-		ha_alert("httpclient: Failed to initialize address %s:%d.\n", __FUNCTION__, __LINE__);
-		goto out_error;
-	}
-
 	if (!sockaddr_alloc(&addr, ss_dst, sizeof(*ss_dst)))
 		goto out_error;