Upstream: least_conn compilation fixes.

Removed duplicate call of ngx_http_upstream_init_round_robin_peer()
overlooked during code changes.  Rewritten "return lcp->free_rr_peer(...)"
as MSVC doesn't like it.

src/http/modules/ngx_http_upstream_least_conn_module.c

diff --git a/src/http/modules/ngx_http_upstream_least_conn_module.c b/src/http/modules/ngx_http_upstream_least_conn_module.c
index bc9a146..50e68b2 100644
--- a/src/http/modules/ngx_http_upstream_least_conn_module.c
+++ b/src/http/modules/ngx_http_upstream_least_conn_module.c
@@ -122,7 +122,6 @@
 ngx_http_upstream_init_least_conn_peer(ngx_http_request_t *r,
     ngx_http_upstream_srv_conf_t *us)
 {
-    ngx_int_t                             rc;
     ngx_http_upstream_lc_peer_data_t     *lcp;
     ngx_http_upstream_least_conn_conf_t  *lcf;
 
@@ -141,8 +140,6 @@
 
     r->upstream->peer.data = &lcp->rrp;
 
-    rc = ngx_http_upstream_init_round_robin_peer(r, us);
-
     if (ngx_http_upstream_init_round_robin_peer(r, us) != NGX_OK) {
         return NGX_ERROR;
     }
@@ -350,7 +347,8 @@
                    "free least conn peer %ui %ui", pc->tries, state);
 
     if (lcp->rrp.peers->single) {
-        return lcp->free_rr_peer(pc, &lcp->rrp, state);
+        lcp->free_rr_peer(pc, &lcp->rrp, state);
+        return;
     }
 
     if (state == 0 && pc->tries == 0) {
@@ -359,7 +357,7 @@
 
     lcp->conns[lcp->rrp.current]--;
 
-    return lcp->free_rr_peer(pc, &lcp->rrp, state);
+    lcp->free_rr_peer(pc, &lcp->rrp, state);
 }