SPDY: a bit smarter ngx_http_spdy_filter_get_data_frame().
SPDY: a bit smarter ngx_http_spdy_filter_get_data_frame().

There is no need to pass FLAG_FIN as a separate argument since it can always be
detected from the last_buf flag of the last frame buffer.

No functional changes.

firebase/nginx,hy0kl/nginx,hy0kl/nginx,firebase/nginx,firebase/nginx,firebase/nginx,hy0kl/nginx