make-memstick.sh: use 'set -e' to abort if any step fails

Description

make-memstick.sh: use 'set -e' to abort if any step fails

Also remove the now-redundant error handling that was only for makefs.

This script was run on an older FreeBSD host that lacked efi-on-mbr
support in makefs. A warning was emitted on the console (from makefs)
but the script continued running and exited with 0.

MFC of r308171 (arm64) and r323178 (other architectures).

Details

Committed
emasteSep 12 2017, 12:44 AM
Parents
rS323475: MFC r323003,r323004:
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