Change the recently added VG_(memcmp) to use UChars instead of Chars.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@1439 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/coregrind/vg_mylibc.c b/coregrind/vg_mylibc.c
index 3792ac2..2ec0c68 100644
--- a/coregrind/vg_mylibc.c
+++ b/coregrind/vg_mylibc.c
@@ -967,13 +967,13 @@
 Int VG_(memcmp) ( const void* s1, const void* s2, Int n )
 {
    Int res;
-   Char a0;
-   Char b0;
+   UChar a0;
+   UChar b0;
    vg_assert(n >= 0);
 
    while (n != 0) {
-      a0 = ((Char *) s1)[0];
-      b0 = ((Char *) s2)[0];
+      a0 = ((UChar *) s1)[0];
+      b0 = ((UChar *) s2)[0];
       s1 += 1;
       s2 += 1;
       res = a0 - b0;