[PATCH 0/1] MR7099: windowscodecs: Simplify png_decoder_get_metadata_blocks using realloc.

[Jeffrey Smith (＠whydoubt)]

The code currently `malloc`s a larger memory buffer, and if successful: `memcpy`s the old memory buffer to the new, `free`s the old, and reassigns the pointer.  This logic can all be reduced to a `realloc`.

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https://gitlab.winehq.org/wine/wine/-/merge_requests/7099