[libglnx/wip/smcv/const-struct-stat] fdio: Be const-correct for struct stat

[Simon McVittie <smcv src gnome org>]

commit dbed5c58db9db3331b2139f77e2b8a90642f0758
Author: Simon McVittie <smcv collabora com>
Date:   Wed Jun 3 17:51:19 2020 +0100

    fdio: Be const-correct for struct stat
    
    We don't modify this struct (if non-NULL), so it can be const. In
    particular, this is helpful if calling glnx_file_copy_at() from
    nftw() to implement the equivalent of `cp -a --reflink=auto`.
    
    Signed-off-by: Simon McVittie <smcv collabora com>

 glnx-fdio.c | 2 +-
 glnx-fdio.h | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/glnx-fdio.c b/glnx-fdio.c
index 31bb15d..6ae6ec7 100644
--- a/glnx-fdio.c
+++ b/glnx-fdio.c
@@ -939,7 +939,7 @@ glnx_regfile_copy_bytes (int fdf, int fdt, off_t max_bytes)
 gboolean
 glnx_file_copy_at (int                   src_dfd,
                    const char           *src_subpath,
-                   struct stat          *src_stbuf,
+                   const struct stat    *src_stbuf,
                    int                   dest_dfd,
                    const char           *dest_subpath,
                    GLnxFileCopyFlags     copyflags,
diff --git a/glnx-fdio.h b/glnx-fdio.h
index 9c57dc5..f95e473 100644
--- a/glnx-fdio.h
+++ b/glnx-fdio.h
@@ -193,7 +193,7 @@ typedef enum {
 gboolean
 glnx_file_copy_at (int                   src_dfd,
                    const char           *src_subpath,
-                   struct stat          *src_stbuf,
+                   const struct stat    *src_stbuf,
                    int                   dest_dfd,
                    const char           *dest_subpath,
                    GLnxFileCopyFlags     copyflags,