[blob] Allow null parent in create_sub_blob()
Like font and unicode.
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@ -149,7 +149,7 @@ hb_blob_create_sub_blob (hb_blob_t *parent,
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{
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hb_blob_t *blob;
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if (!length || offset >= parent->length)
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if (!length || !parent || offset >= parent->length)
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return hb_blob_get_empty ();
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hb_blob_make_immutable (parent);
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