Bug#22680706: 5.5 DOES NOT BUILD WITH GCC5

Fix the following two build warnings so that 5.5 can be compiled
with GCC5.

storage/innobase/dict/dict0crea.c:1143:21: error: logical not is only applied
to the left hand side of comparison [-Werror=logical-not-parentheses]
   ut_a(!node->index == (err != DB_SUCCESS));
                     ^
storage/innobase/log/log0recv.c:1770:20: error: logical not is only applied
to the left hand side of comparison [-Werror=logical-not-parentheses]
  ut_ad(!allow_ibuf == mutex_own(&log_sys->mutex));
                    ^

storage/innobase/dict/dict0crea.c

 /*****************************************************************************
 
-Copyright (c) 1996, 2014, Oracle and/or its affiliates. All Rights Reserved.
+Copyright (c) 1996, 2016, Oracle and/or its affiliates. All Rights Reserved.
 
 This program is free software; you can redistribute it and/or modify it under
 the terms of the GNU General Public License as published by the Free Software
@@ -1140,7 +1140,7 @@ dict_create_index_step(
 			>= DICT_TF_FORMAT_ZIP);
 
 		node->index = dict_index_get_if_in_cache_low(index_id);
-		ut_a(!node->index == (err != DB_SUCCESS));
+		ut_a((node->index == NULL) == (err != DB_SUCCESS));
 
 		if (err != DB_SUCCESS) {
 

storage/innobase/log/log0recv.c

 /*****************************************************************************
 
-Copyright (c) 1997, 2015, Oracle and/or its affiliates. All Rights Reserved.
+Copyright (c) 1997, 2016, Oracle and/or its affiliates. All Rights Reserved.
 
 This program is free software; you can redistribute it and/or modify it under
 the terms of the GNU General Public License as published by the Free Software
@@ -1767,7 +1767,7 @@ loop:
 		goto loop;
 	}
 
-	ut_ad(!allow_ibuf == mutex_own(&log_sys->mutex));
+	ut_ad((!allow_ibuf) == mutex_own(&log_sys->mutex));
 
 	if (!allow_ibuf) {
 		recv_no_ibuf_operations = TRUE;