Index: sdk/lib/drivers/ntoskrnl_vista/rtl.c
===================================================================
--- sdk/lib/drivers/ntoskrnl_vista/rtl.c	(revision 71918)
+++ sdk/lib/drivers/ntoskrnl_vista/rtl.c	(working copy)
@@ -23,7 +23,7 @@
     ULONG written;
     ULONG ch;
     BYTE utf8_ch[4];
-    ULONG utf8_ch_len;
+    ULONG utf8_ch_len = 0;
 
     if (!uni_src)
         return STATUS_INVALID_PARAMETER_4;