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This fixes most of the simpler shellcheck errors in shellcheck 0.4.6. There are still a few warnings left that weren't simple to fix or would have required more testing before I was confident in them. Change-Id: I79ab3614cc1d69d3dfe1e0374e930313f2011cbf Signed-off-by: Martin Roth <gaumless@gmail.com> Reviewed-on: https://review.coreboot.org/27598 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Patrick Georgi <pgeorgi@google.com>