NTFS: Fix compilation warnings with gcc-4.0.2 on SUSE 10.0.

Signed-off-by: Anton Altaparmakov <aia21@cantab.net>
diff --git a/fs/ntfs/attrib.c b/fs/ntfs/attrib.c
index df2e209..eda056b 100644
--- a/fs/ntfs/attrib.c
+++ b/fs/ntfs/attrib.c
@@ -91,7 +91,7 @@
 	struct page *put_this_page = NULL;
 	int err = 0;
 	BOOL ctx_is_temporary, ctx_needs_reset;
-	ntfs_attr_search_ctx old_ctx;
+	ntfs_attr_search_ctx old_ctx = { NULL, };
 
 	ntfs_debug("Mapping runlist part containing vcn 0x%llx.",
 			(unsigned long long)vcn);