Merged r3047:3048 from branches/SDL-1.2: SDL_revcpy() off-by-one fix.

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%402334

src/stdlib/SDL_string.c

@@ -298,8 +298,8 @@ SDL_revcpy(void *dst, const void *src, size_t len)
 {
     char *srcp = (char *) src;
     char *dstp = (char *) dst;
-    srcp += len;
-    dstp += len;
+    srcp += len-1;
+    dstp += len-1;
     while (len--) {
         *dstp-- = *srcp--;
     }