[libxml2] Add suffix to unsigned constant in xmlmemory.c

[Nick Wellnhofer <nwellnhof src gnome org>]

commit f4a74bf0ae6fa46ec9817536f2496f375e0f4bf4
Author: Nick Wellnhofer <wellnhofer aevum de>
Date:   Tue Jan 25 02:21:05 2022 +0100

    Add suffix to unsigned constant in xmlmemory.c
    
    Avoids an integer conversion warning with UBSan.

 xmlmemory.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/xmlmemory.c b/xmlmemory.c
index c51f49ae..e0b2531a 100644
--- a/xmlmemory.c
+++ b/xmlmemory.c
@@ -78,7 +78,7 @@ void xmlMallocBreakpoint(void);
  * Each of the blocks allocated begin with a header containing information
  */
 
-#define MEMTAG 0x5aa5
+#define MEMTAG 0x5aa5U
 
 #define MALLOC_TYPE 1
 #define REALLOC_TYPE 2