Fixing compilation problems with this DBUG_ASSERT_AS_PRINTF

For example, with this cmake command line:

cmake . -DCMAKE_C_FLAGS="-DDBUG_ASSERT_AS_PRINTF" \
        -DCMAKE_CXX_FLAGS="-DDBUG_ASSERT_AS_PRINTF"

sql-common/my_time.c

@@ -59,7 +59,8 @@ uint calc_days_in_year(uint year)
 }
 
 
-#ifndef DBUG_OFF
+#ifdef DBUG_ASSERT_EXISTS
+
 
 static const ulonglong C_KNOWN_FLAGS= C_TIME_NO_ZERO_IN_DATE |
                                       C_TIME_NO_ZERO_DATE    |

sql/my_decimal.cc

@@ -380,7 +380,7 @@ my_decimal::my_decimal(Field *field)
 {
   init();
   DBUG_ASSERT(!field->is_null());
-#ifndef DBUG_OFF
+#ifdef DBUG_ASSERT_EXISTS
   my_decimal *dec=
 #endif
   field->val_decimal(this);