fix segfault if no http section is defined in confguraiton,
the bug has been introduced in r1259
diff --git a/src/http/ngx_http_config.h b/src/http/ngx_http_config.h
index 6629210..74f6f6c 100644
--- a/src/http/ngx_http_config.h
+++ b/src/http/ngx_http_config.h
@@ -69,8 +69,10 @@
((ngx_http_conf_ctx_t *) cf->ctx)->loc_conf[module.ctx_index]
#define ngx_http_cycle_get_module_main_conf(cycle, module) \
- ((ngx_http_conf_ctx_t *) \
- cycle->conf_ctx[ngx_http_module.index])->main_conf[module.ctx_index]
+ (cycle->conf_ctx[ngx_http_module.index] ? \
+ ((ngx_http_conf_ctx_t *) cycle->conf_ctx[ngx_http_module.index]) \
+ ->main_conf[module.ctx_index]: \
+ NULL)
#endif /* _NGX_HTTP_CONFIG_H_INCLUDED_ */