[libwnck/wip/warnings3: 9/12] screen: fix signed / unsigned warnings

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 1312762e14eb15550b0887afac79822bc2e63ea8
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Fri Apr 28 14:50:24 2017 +0300

    screen: fix signed / unsigned warnings

 libwnck/screen.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/libwnck/screen.c b/libwnck/screen.c
index 9224a01..9ef3a1d 100644
--- a/libwnck/screen.c
+++ b/libwnck/screen.c
@@ -1888,12 +1888,12 @@ update_viewport_settings (WnckScreen *screen)
               space = wnck_screen_get_workspace (screen, i);
               g_assert (space != NULL);
 
-             /* p_coord[x] is unsigned, and thus >= 0 */
-              if (p_coord[x] > space_width - screen_width)
+              /* p_coord[x] is unsigned, and thus >= 0 */
+              if ((int) p_coord[x] > space_width - screen_width)
                 p_coord[x] = space_width - screen_width;
 
-             /* p_coord[y] is unsigned, and thus >= 0 */
-              if (p_coord[y] > space_height - screen_height)
+              /* p_coord[y] is unsigned, and thus >= 0 */
+              if ((int) p_coord[y] > space_height - screen_height)
                 p_coord[y] = space_height - screen_height;
 
              if (_wnck_workspace_set_viewport (space,