util/ecst.c: Fix resource leak
util/ecst.c: Fix resource leak

Change-Id: I3397dcaf90c8141efee170183a6e54e8430924f9
Signed-off-by: Patrick Georgi <bc411205f21846a74924ee7b489c75617ec76078@google.com>
Found-by: Coverity Scan #58168
Reviewed-on: https://chromium-review.googlesource.com/1151124
Commit-Ready: Patrick Georgi <bc411205f21846a74924ee7b489c75617ec76078@chromium.org>
Tested-by: Patrick Georgi <bc411205f21846a74924ee7b489c75617ec76078@chromium.org>
Reviewed-by: Daisuke Nojiri <fd5f93af191bf7e8f73ea71cc3c0f66b41b1dd49@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec