brcmfmac43456-sdio.clm_blob became unused as of 3849fd9598 (diff-29a21aa2e853dac8828dabac348f6b5449c9ebe6192b6ba4bd7e118f90734fe6) (see that 'clm_blob' is removed) Rather, this file exists in the src repo: ef8e000ddd/clm_blob/broadcom/AP6256/brcmfmac43456-sdio.clm_blob
3849fd9598 (diff-29a21aa2e853dac8828dabac348f6b5449c9ebe6192b6ba4bd7e118f90734fe6)
ef8e000ddd/clm_blob/broadcom/AP6256/brcmfmac43456-sdio.clm_blob