handle Win32 ReadFile() EOF state in Unix way

src/os/win32/ngx_files.c

diff --git a/src/os/win32/ngx_files.c b/src/os/win32/ngx_files.c
index b6f9bb6..c74ec58 100644
--- a/src/os/win32/ngx_files.c
+++ b/src/os/win32/ngx_files.c
@@ -95,7 +95,13 @@
     }
 
     if (ReadFile(file->fd, buf, size, &n, povlp) == 0) {
-        ngx_log_error(NGX_LOG_ERR, file->log, ngx_errno, "ReadFile() failed");
+        err = ngx_errno;
+
+        if (err == ERROR_HANDLE_EOF) {
+            return 0;
+        }
+
+        ngx_log_error(NGX_LOG_ERR, file->log, err, "ReadFile() failed");
         return NGX_ERROR;
     }