[flac-dev] [PATCH] check iterator->is_writable

[lvqcl]

In libFLAC/metadata_iterators.c, functions
   FLAC__metadata_simple_iterator_set_block()
   FLAC__metadata_simple_iterator_insert_block_after()

check the value of iterator->is_writable, but

   FLAC__metadata_simple_iterator_delete_block()

doesn't do it. Is there any reason for it? Because I cannot see any.

The patch adds this missing check.
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