[erlang-patches] Fix crash in mnesia_controller due to a function_clause exception from is_tab_blocked/1

[Ahmed Omar]

git fetch git://github.com/spawnthink/otp.git fix_mnesia_block_table

Fix crash in mnesia_controller due to a function_clause exception from
is_tab_blocked/1

If mnesia_controller:block_table/1 is called twice for same table,
the new stored value of {Tab, where_to_commit} will be {blocked,
{blocked,List}}.
This will result in an exception when calling is_tab_blocked/1.
mnesia_conttoller:block_table/1 should check if the table is already
blocked.

https://github.com/spawnthink/otp/compare/fix_mnesia_block_table.patch
https://github.com/spawnthink/otp/compare/fix_mnesia_block_table

Best Regards,
Ahmed Omar
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