fix segfault when a header starts with "\rX"
and logging is set to info or debug level

src/http/ngx_http_parse.c

diff --git a/src/http/ngx_http_parse.c b/src/http/ngx_http_parse.c
index fd48fcd..c1fba52 100644
--- a/src/http/ngx_http_parse.c
+++ b/src/http/ngx_http_parse.c
@@ -743,6 +743,7 @@
 
             switch (ch) {
             case CR:
+                r->header_name_start = p;
                 r->header_end = p;
                 state = sw_header_almost_done;
                 break;