dummyflasher.c: Don't leak `emu_persistent_image`

Ensure `emu_persistent_image` doesn't end up leaking memory.

Change-Id: I76529973cefcc6a1472681e1f4da8239fcbf07a6
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/54905
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Edward O'Callaghan <quasisec@chromium.org>
1 file changed