advpack: Fix buffer overrun in convert_file_list.
diff --git a/dlls/advpack/files.c b/dlls/advpack/files.c
index f351bb4..5003239 100644
--- a/dlls/advpack/files.c
+++ b/dlls/advpack/files.c
@@ -564,9 +564,7 @@
     dwLen = last - first + 3; /* room for double-null termination */
     szConvertedList = HeapAlloc(GetProcessHeap(), 0, dwLen);
     lstrcpynA(szConvertedList, first, dwLen - 1);
-
     szConvertedList[dwLen - 1] = '\0';
-    szConvertedList[dwLen] = '\0';
 
     /* empty list */
     if (!lstrlenA(szConvertedList))