Fix a few casts that dropped type qualifiers. As pointed out by
-Wcast-qual.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14554 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/helgrind/hg_intercepts.c b/helgrind/hg_intercepts.c
index 71bd402..fb9963a 100644
--- a/helgrind/hg_intercepts.c
+++ b/helgrind/hg_intercepts.c
@@ -159,8 +159,8 @@
 __attribute__((noinline))
 static int my_memcmp ( const void* ptr1, const void* ptr2, size_t size)
 {
-   unsigned char* uchar_ptr1 = (unsigned char*) ptr1;
-   unsigned char* uchar_ptr2 = (unsigned char*) ptr2;
+   const unsigned char* uchar_ptr1 = (const unsigned char*) ptr1;
+   const unsigned char* uchar_ptr2 = (const unsigned char*) ptr2;
    size_t i;
    for (i = 0; i < size; ++i) {
       if (uchar_ptr1[i] != uchar_ptr2[i])