programs/explorer: sign compare fixes

[Austin English]

with patch

-- 
-Austin
-------------- next part --------------
diff --git a/programs/explorer/systray.c b/programs/explorer/systray.c
index 9be95bb..d3670d2 100644
--- a/programs/explorer/systray.c
+++ b/programs/explorer/systray.c
@@ -53,8 +53,8 @@ struct icon
 static struct list icon_list = LIST_INIT( icon_list );
 static HWND tray_window;
 
-static unsigned int alloc_displayed;
-static unsigned int nb_displayed;
+static int alloc_displayed;
+static int nb_displayed;
 static struct icon **displayed;  /* array of currently displayed icons */
 
 static BOOL hide_systray;
@@ -220,7 +220,7 @@ static BOOL show_icon(struct icon *icon)
 /* make an icon invisible */
 static BOOL hide_icon(struct icon *icon)
 {
-    unsigned int i;
+    int i;
 
     WINE_TRACE("id=0x%x, hwnd=%p\n", icon->id, icon->owner);
 
@@ -455,7 +455,7 @@ static LRESULT WINAPI tray_wndproc( HWND hwnd, UINT msg, WPARAM wparam, LPARAM l
 
     case WM_PAINT:
         {
-            unsigned int i;
+            int i;
             PAINTSTRUCT ps;
             HDC hdc;