Proper backtracking after space in a request line.

src/http/ngx_http_parse.c

diff --git a/src/http/ngx_http_parse.c b/src/http/ngx_http_parse.c
index 973bc74..cf89b8c 100644
--- a/src/http/ngx_http_parse.c
+++ b/src/http/ngx_http_parse.c
@@ -617,6 +617,7 @@
             default:
                 r->space_in_uri = 1;
                 state = sw_check_uri;
+                p--;
                 break;
             }
             break;
@@ -670,6 +671,7 @@
             default:
                 r->space_in_uri = 1;
                 state = sw_uri;
+                p--;
                 break;
             }
             break;