Fixed incorrect counting the length of headers in a SCGI request.

src/http/modules/ngx_http_scgi_module.c

diff --git a/src/http/modules/ngx_http_scgi_module.c b/src/http/modules/ngx_http_scgi_module.c
index 1feac71..168f497 100644
--- a/src/http/modules/ngx_http_scgi_module.c
+++ b/src/http/modules/ngx_http_scgi_module.c
@@ -558,8 +558,10 @@
 
             while (*(uintptr_t *) le.ip) {
                 lcode = *(ngx_http_script_len_code_pt *) le.ip;
-                len += lcode(&le) + 1;
+                len += lcode(&le);
             }
+            len++;
+
             le.ip += sizeof(uintptr_t);
         }
     }