futility/cmd_show: set uninitialized variable
futility/cmd_show: set uninitialized variable

Fix coreboot standalone build by initializing body_c in show_fw_preamble_buf.

BUG=b:254014539

Signed-off-by: Selma Bensaid <1ef3411d372f552e346dcae51383719b3f44fcf0@intel.com>
Change-Id: I963a1e8556b36302d455710d4561fc8460c44405
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/3961988
Reviewed-by: Yu-Ping Wu <e17b963d2ce5bddd1fecae25c320252b132e804d@chromium.org>
Reviewed-by: Jakub Czapiga <0d8ca27a83d6ce60a79cbbd5669c90d47d7d7de8@google.com>
Tested-by: Yu-Ping Wu <e17b963d2ce5bddd1fecae25c320252b132e804d@chromium.org>
Commit-Queue: Yu-Ping Wu <e17b963d2ce5bddd1fecae25c320252b132e804d@chromium.org>

coreboot/vboot,coreboot/vboot,coreboot/vboot,coreboot/vboot,coreboot/vboot