[libgdata] tests: Fix use of an unsigned variable as signed

[Philip Withnall <pwithnall src gnome org>]

commit 2ad79db3a3e9c315152b3470a6cb2fba644d7ac8
Author: Philip Withnall <philip tecnocode co uk>
Date:   Wed Jan 25 00:34:13 2017 +0000

    tests: Fix use of an unsigned variable as signed
    
    This code was supposed to be using a signed variable for the comparison,
    but accidentally ended up using a signed one (and the wrong abs()
    function). Fix that.
    
    Spotted by Clang.

 gdata/tests/picasaweb.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/gdata/tests/picasaweb.c b/gdata/tests/picasaweb.c
index 6a9f71e..b77f7c8 100644
--- a/gdata/tests/picasaweb.c
+++ b/gdata/tests/picasaweb.c
@@ -1778,7 +1778,7 @@ test_album_new (void)
        gchar *xml, *parsed_time_str;
        GRegex *regex;
        GMatchInfo *match_info;
-       guint64 delta;
+       gint64 delta;
        GTimeVal timeval;
 
        g_test_bug ("598893");
@@ -1818,7 +1818,7 @@ test_album_new (void)
        g_assert (g_regex_match (regex, xml, 0, &match_info) == TRUE);
        parsed_time_str = g_match_info_fetch (match_info, 2);
        delta = g_ascii_strtoull (parsed_time_str, NULL, 10) - (((guint64) timeval.tv_sec) * 1000 + 
((guint64) timeval.tv_usec) / 1000);
-       g_assert_cmpuint (abs (delta), <, 1000);
+       g_assert_cmpuint (ABS (delta), <, 1000);
 
        g_free (parsed_time_str);
        g_free (xml);