Win32: plugged memory leak.

src/os/win32/ngx_files.c

diff --git a/src/os/win32/ngx_files.c b/src/os/win32/ngx_files.c
index ee846cd..c1c749e 100644
--- a/src/os/win32/ngx_files.c
+++ b/src/os/win32/ngx_files.c
@@ -753,6 +753,8 @@
         goto invalid;
     }
 
+    ngx_free(lu);
+
     return NGX_OK;
 
 invalid: