bk commit into 5.1 tree (mskold:1.2555) BUG#31233

[Martin Skold]

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5.1 repository of mskold.  When mskold does a push these changes
will be propagated to the main repository and, within 24 hours after the
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ChangeSet@stripped, 2008-03-13 15:31:33+01:00, mskold@stripped +1 -0
  bug#31233 mysql_alter_table() fails to drop UNIQUE KEY: Removed compiler warning

  sql/sql_table.cc@stripped, 2008-03-13 15:31:26+01:00, mskold@stripped +1 -1
    bug#31233 mysql_alter_table() fails to drop UNIQUE KEY: Removed compiler warning

diff -Nrup a/sql/sql_table.cc b/sql/sql_table.cc
--- a/sql/sql_table.cc	2008-03-13 15:27:31 +01:00
+++ b/sql/sql_table.cc	2008-03-13 15:31:26 +01:00
@@ -5344,7 +5344,7 @@ compare_tables(THD *thd,
         }
         else
         {
-          bool is_not_null;
+          bool is_not_null= true;
 
           *alter_flags|= HA_DROP_UNIQUE_INDEX;
           key_part= table_key->key_part;