[libglnx] fdio: Add string prefix for glnx_fstat()

[Colin Walters <walters src gnome org>]

commit 61ef326ad8381ea08ad3045fd0c65f974684afde
Author: Colin Walters <walters verbum org>
Date:   Tue Jul 11 10:33:01 2017 -0400

    fdio: Add string prefix for glnx_fstat()
    
    For consistency.

 glnx-fdio.h |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)
---
diff --git a/glnx-fdio.h b/glnx-fdio.h
index d6352b2..902f8d2 100644
--- a/glnx-fdio.h
+++ b/glnx-fdio.h
@@ -236,8 +236,7 @@ glnx_fstat (int           fd,
             GError      **error)
 {
   if (TEMP_FAILURE_RETRY (fstat (fd, buf)) != 0)
-    return glnx_throw_errno (error);
-
+    return glnx_throw_errno_prefix (error, "fstat");
   return TRUE;
 }