64-bit cleanness: Yet more UInt-->SizeT changes.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@2910 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/memcheck/mac_needs.c b/memcheck/mac_needs.c
index ce09679..87b5826 100644
--- a/memcheck/mac_needs.c
+++ b/memcheck/mac_needs.c
@@ -876,7 +876,7 @@
 
    case VG_USERREQ__MALLOCLIKE_BLOCK: {
       Addr p         = (Addr)arg[1];
-      UInt sizeB     =       arg[2];
+      SizeT sizeB    =       arg[2];
       UInt rzB       =       arg[3];
       Bool is_zeroed = (Bool)arg[4];