Minor comment fixes
diff --git a/include/polarssl/cipher.h b/include/polarssl/cipher.h
index 13d714b..0ab2b56 100644
--- a/include/polarssl/cipher.h
+++ b/include/polarssl/cipher.h
@@ -491,4 +491,4 @@
 }
 #endif
 
-#endif /* POLARSSL_MD_H */
+#endif /* POLARSSL_CIPHER_H */