SPDY: refactored ngx_http_spdy_state_read_data().

There's no more need in a separate indicator of frame completeness
after d74889fbf06d.

src/http/ngx_http_spdy.c

diff --git a/src/http/ngx_http_spdy.c b/src/http/ngx_http_spdy.c
index d821475..9e4ac34 100644
--- a/src/http/ngx_http_spdy.c
+++ b/src/http/ngx_http_spdy.c
@@ -1498,7 +1498,6 @@
     ssize_t                    n;
     ngx_buf_t                 *buf;
     ngx_int_t                  rc;
-    ngx_uint_t                 complete;
     ngx_temp_file_t           *tf;
     ngx_http_request_t        *r;
     ngx_http_spdy_stream_t    *stream;
@@ -1523,12 +1522,8 @@
 
     size = end - pos;
 
-    if (size >= sc->length) {
+    if (size > sc->length) {
         size = sc->length;
-        complete = 1;
-
-    } else {
-        complete = 0;
     }
 
     r = stream->request;
@@ -1600,7 +1595,7 @@
         r->request_length += size;
     }
 
-    if (!complete) {
+    if (sc->length) {
         return ngx_http_spdy_state_save(sc, pos, end,
                                         ngx_http_spdy_state_read_data);
     }