[gdk-pixbuf] gif: Fix compiler warning reg. type conversion

[Tobias Mueller <tobiasmue src gnome org>]

commit 853c60427f7ebb6b9cdfd142923167af70f13536
Author: Tobias Mueller <muelli cryptobitch de>
Date:   Tue Aug 1 22:37:35 2017 +0100

    gif: Fix compiler warning reg. type conversion
    
    With -Wconversion gcc complains with the following warning:
    
    io-gif.c: In function ‘gif_read’:
    io-gif.c:246:20: warning: conversion to ‘guint {aka unsigned int}’ from
    ‘size_t {aka long unsigned int}’ may alter its value [-Wconversion]
        context->ptr += len;
                        ^
    io-gif.c:258:28: warning: conversion to ‘guint {aka unsigned int}’ from
    ‘size_t {aka long unsigned int}’ may alter its value [-Wconversion]
       context->amount_needed = len - (context->size - context->ptr);
    
    This change simply changes their types to match the rhs.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=786261

 gdk-pixbuf/io-gif.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/gdk-pixbuf/io-gif.c b/gdk-pixbuf/io-gif.c
index 4efd00a..057960c 100644
--- a/gdk-pixbuf/io-gif.c
+++ b/gdk-pixbuf/io-gif.c
@@ -142,9 +142,9 @@ struct _GifContext
        GdkPixbufModuleUpdatedFunc update_func;
        gpointer user_data;
         guchar *buf;
-       guint ptr;
-       guint size;
-       guint amount_needed;
+       gsize ptr;
+       gsize size;
+       gsize amount_needed;
 
        /* extension context */
        guchar extension_label;