Resolve "FIX_1585_ASAN_FORMAT_SW_ALT / Format switching memory changes cause MSAN/ASAN errors in decoder usage"

Archit Tamarapurequested to merge
float-1593-fix_1585_asan_format_sw_alt-format-switching-memory-changes-cause-msan-asan-errors-in into main

Reason why this change is needed

  • Prevents attempting to free a garbage pointer if the decoder is opened and immediately closed

Description of the change

  • Set the pointer to NULL at init

Affected operating points

  • Decoder API

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