server: Replace 1 << 31 by 1u << 31 to avoid shift overflow in in get_active_hooks.

[Gerald Pfeifer]

With this change, there only should be 18 files in the tree 
potentially showing similar cases.

Gerald
---
 server/hook.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/server/hook.c b/server/hook.c
index 3abd8d9..a8e6ab9 100644
--- a/server/hook.c
+++ b/server/hook.c
@@ -356,7 +356,7 @@ unsigned int get_active_hooks(void)
 {
     struct hook_table *table = get_queue_hooks( current );
     struct hook_table *global_hooks = get_global_hooks( current );
-    unsigned int ret = 1 << 31;  /* set high bit to indicate that the bitmap is valid */
+    unsigned int ret = 1u << 31;  /* set high bit to indicate that the bitmap is valid */
     int id;
 
     for (id = WH_MINHOOK; id <= WH_WINEVENT; id++)
-- 
2.4.6