Minor simplification.

Author: TheRealMDoerr

src/java.base/share/classes/com/sun/crypto/provider/AES_Crypt.java

@@ -935,10 +935,8 @@ void init(boolean decrypting, String algorithm, byte[] key)
             prevKey = key.clone();
         }
 
-        if (decrypting) {
-            if (sessionKd == null) {
-                sessionKd = genInvRoundKeys(sessionKe, rounds);
-            }
+        if (decrypting && (sessionKd == null)) {
+            sessionKd = genInvRoundKeys(sessionKe, rounds);
         }
     }