update/project/trees: split up main()

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

script/update/project/trees

@@ -19,12 +19,8 @@ main()
 
 	[ -z "${1}" ] && err "project name not specified"
 	project="${1}" && shift 1
-	cfgsdir="config/${project}"
-	[ -d "${cfgsdir}" ] || err "unsupported project name"
 
-	targets=$(listitems "${cfgsdir}")
-	[ $# -gt 0 ] && targets=$@
-	[ -z "${targets}" ] && err "No targets for project: ${project}"
+	configure_targets $@
 
 	for x in ${targets}; do
 		x_ rm -f "${cfgsdir}/"*/seen
@@ -32,6 +28,18 @@ main()
 	done
 }
 
+configure_targets()
+{
+	cfgsdir="config/${project}"
+	[ -d "${cfgsdir}" ] || err "unsupported project name"
+
+	targets=$(listitems "${cfgsdir}")
+	[ $# -gt 0 ] && targets=$@
+	[ -z "${targets}" ] || return 0
+
+	err "No targets for project: ${project}"
+}
+
 download_for_target()
 {
 	_target="${1}"