crypto: mv_cesa - Add missing #define

Clearly this was meant to be an include guard, but the #define was
missing.

Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/drivers/crypto/mv_cesa.h b/drivers/crypto/mv_cesa.h
index 08fcb11..9249d3e 100644
--- a/drivers/crypto/mv_cesa.h
+++ b/drivers/crypto/mv_cesa.h
@@ -1,4 +1,5 @@
 #ifndef __MV_CRYPTO_H__
+#define __MV_CRYPTO_H__
 
 #define DIGEST_INITIAL_VAL_A	0xdd00
 #define DIGEST_INITIAL_VAL_B	0xdd04