lbmk: don't use status for unconditional returns

in cases where lbmk must always return from a function,
there are some cases where it relies on non-zero exit
status, which in practise is always the case, but may
change in the future if the relevant part is modified

e.g. do_something && return 0

the proper form is:
do_something
return 0

also do this for unconditional exits

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

script/build/roms

@@ -31,8 +31,12 @@ main()
 {
 	while [ $# -gt 0 ]; do
 		case ${1} in
-		help) usage && exit 0 ;;
-		list) items config/coreboot && exit 0 ;;
+		help)
+			usage
+			exit 0 ;;
+		list)
+			items config/coreboot || :
+			exit 0 ;;
 		-d) _displaymode="${2}" ;;
 		-p) _payload="${2}" ;;
 		-k) _keyboard="${2}" ;;
@@ -216,10 +220,11 @@ build_target()
 build_roms()
 {
 	cbcfg="${1}"
-	[ ! -f "${cbcfg}" ] && \
+	if [ ! -f "${cbcfg}" ]; then
 		printf "'%s' does not exist. Skipping build for %s %s %s\n" \
-		    "${cbcfg}" "${board}" "${displaymode}" "${initmode}" \
-		    1>&2 && return 0
+		    "${cbcfg}" "${board}" "${displaymode}" "${initmode}" 1>&2
+		return 0
+	fi
 
 	x_ ./update trees -b coreboot ${board}