SPDY: fixed connection leak while waiting for request headers.

If an error occurs in a SPDY connection, the c->error flag is set on every fake
request connection, and its read or write event handler is called, in order to
finalize it.  But while waiting for request headers, it was a no-op since the
read event handler had been set to ngx_http_empty_handler().

src/http/ngx_http_spdy.c

diff --git a/src/http/ngx_http_spdy.c b/src/http/ngx_http_spdy.c
index a1ac184..6802981 100644
--- a/src/http/ngx_http_spdy.c
+++ b/src/http/ngx_http_spdy.c
@@ -145,6 +145,8 @@
 static void ngx_http_spdy_run_request(ngx_http_request_t *r);
 static ngx_int_t ngx_http_spdy_init_request_body(ngx_http_request_t *r);
 
+static void ngx_http_spdy_close_stream_handler(ngx_event_t *ev);
+
 static void ngx_http_spdy_handle_connection_handler(ngx_event_t *rev);
 static void ngx_http_spdy_keepalive_handler(ngx_event_t *rev);
 static void ngx_http_spdy_finalize_connection(ngx_http_spdy_connection_t *sc,
@@ -1825,7 +1827,7 @@
 
     rev->data = fc;
     rev->ready = 1;
-    rev->handler = ngx_http_empty_handler;
+    rev->handler = ngx_http_spdy_close_stream_handler;
     rev->log = log;
 
     ngx_memcpy(wev, rev, sizeof(ngx_event_t));
@@ -2615,6 +2617,22 @@
 }
 
 
+static void
+ngx_http_spdy_close_stream_handler(ngx_event_t *ev)
+{
+    ngx_connection_t    *fc;
+    ngx_http_request_t  *r;
+
+    fc = ev->data;
+    r = fc->data;
+
+    ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
+                   "spdy close stream handler");
+
+    ngx_http_spdy_close_stream(r->spdy_stream, 0);
+}
+
+
 void
 ngx_http_spdy_close_stream(ngx_http_spdy_stream_t *stream, ngx_int_t rc)
 {