Make it work on opensolaris

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/verify.c b/verify.c
index 0bb348f..d602534 100644
--- a/verify.c
+++ b/verify.c
@@ -112,7 +112,7 @@
  */
 static inline unsigned int __hdr_size(int verify_type)
 {
-	unsigned int len;
+	unsigned int len = len;
 
 	switch (verify_type) {
 	case VERIFY_NONE: