[gimp/gimp-2-8] fix bogus overflow warning

[Nils Philippsen <nphilipp src gnome org>]

commit bc610c8fbd61e9574a2c378829b6ab91047d61b7
Author: Nils Philippsen <nils redhat com>
Date:   Wed Mar 6 12:16:43 2013 +0100

    fix bogus overflow warning
    
    tile-swap.c: In function ‘tile_swap_command’:
    tile-swap.c:721:6: warning: assuming signed overflow does not occur when
    assuming that (X + c) < X is always false [-Wstrict-overflow]

 app/base/tile-swap.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/app/base/tile-swap.c b/app/base/tile-swap.c
index b65526e..ecc7dc1 100644
--- a/app/base/tile-swap.c
+++ b/app/base/tile-swap.c
@@ -110,7 +110,7 @@ static void          tile_swap_gap_destroy    (SwapFileGap *gap);
 
 static SwapFile     * gimp_swap_file   = NULL;
 
-static const gint64   swap_file_grow   = 1024 * TILE_WIDTH * TILE_HEIGHT * 4;
+static const guint64  swap_file_grow   = 1024 * TILE_WIDTH * TILE_HEIGHT * 4;
 
 static gboolean       seek_err_msg     = TRUE;
 static gboolean       read_err_msg     = TRUE;