error handling code cleanup and fixes

in some cases, use of x_ or xx_ can be error-prone,
due to the way $@ is handled; commands requiring
quotes, or with funny file names as arguments such
as spaces in the file name, or other special
characters, can make the x/xx functions break.

in those cases, where x/xx must not be used, the
commands use || err instead

in other cases, use of x/xx is superfluous, and has
been removed in some commands.

Signed-off-by: Leah Rowe <leah@libreboot.org>

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