Fix access to potentially freed memory, always initialize sram buffer #10
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- Initialize new buffer, not the buffer which may have been freed during reallocation - growing sram_size without realloc_zero may leave parts of sram_buf unitialized. boot0img created undeterministic images on aarch64, errors were confirmed by valgrind.
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boot0img created undeterministic images on aarch64, errors were confirmed by valgrind.