heif: initialize image pointer#645
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In `heif/main.cpp` the image pointer is not initialized, which could cause a memory access violation. `free_buffer` doesn't set the image pointer to `NULL` and calling `free_buffer` two times will cause a memory access violation. Also, set an explicit emsdk tag, because the library won't build with the latest version of the SDK.
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In
heif/main.cppthe image pointer is not initialized, which could cause a memory access violation.free_bufferdoesn't set the image pointer toNULLand callingfree_buffertwo times will cause a memory access violation.Also, set an explicit emsdk tag, because the library won't build with the latest version of the SDK.