[coreboot] lar seg fault on file not found patch

[Myles Watson]

This is a pretty trivial patch that returns an error message when the
file is not found, instead of seg faulting.

test with:

lar -a coreboot.rom nonexistant_file.bin

Myles

Signed-off-by: Myles Watson <mylesgw at gmail.com>
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