lbmk: Replace err with much simpler implementation

The current implementation is insanely over-engineered,
and completely unnecessary.

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

include/init.sh

@@ -14,8 +14,6 @@ projectsite="https://libreboot.org/"
     export PATH="/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games"
 xbmkpath="$PATH"
 
-xbmk_err="err_"
-
 eval "`setvars "" _nogit board reinstall versiondate aur_notice configdir \
     datadir version xbmkpwd relname xbmkpwd xbmktmp python pyver xbmklocal \
     xbmklock`"

include/inject.sh

@@ -270,7 +270,6 @@ fail_inject()
 inject()
 {
 	need_files="n"
-	xbmk_err="fail_inject"
 	remkdir "$tmpromdel"
 
 	set +u +e

include/lib.sh

@@ -184,28 +184,6 @@ x_()
 err()
 {
 	set -u -e
-
-	xbmk_err_val=0
-	real_err="" && [ -n "${xbmk_err+x}" ] && real_err="$xbmk_err"
-
-	if [ -z "$real_err" ]; then
-		printf "WARNING: err not set. Defaulting to 'err_'\n" 1>&2
-		real_err="err_"
-	fi
-
-	(
-	$real_err "$@" || err_ "Error function '$real_err' *returned* 1"
-	err_ "Error function '$real_err' didn't exit"
-	exit 1 # just in case!
-	) || xbmk_err_val=1 # otherwise, it wrongly did exit 0, not exit 1
-
-	[ $xbmk_err_val -eq 0 ] && err_ "Error function '$real_err' did exit 0"
-	exit 1 # just in case!
-}
-
-err_()
-{
-	[ $# -lt 1 ] && printf "ERROR (but no error message provided)\n" 1>&2
 	[ $# -lt 1 ] || printf "ERROR %s: %s\n" "$0" "$1" 1>&2 || :
 	exit 1
 }