shellcheck fixes

bin/kaleidoscope-builder

@@ -122,7 +122,7 @@ _absolute_filename() {
 }
 
 _find_sketch() {
-	if [ -z ${SKETCH_FILE_PATH} ] || [ ! -f ${SKETCH_FILE_PATH} ]; then
+	if [ -z "${SKETCH_FILE_PATH}" ] || [ ! -f "${SKETCH_FILE_PATH}" ]; then
 	# Didn't find a sketch
 	echo "I couldn't find your sketch (.ino file)" >&2
 	exit 1
@@ -297,12 +297,6 @@ fi
 : "${FQBN:=keyboardio:${ARCH}:${BOARD}}"
 
 
-
-if [ $# -eq 2 ]; then 
-	SKETCH="$1"
-	shift
-fi
-
 if [ $# -eq 1 ]; then
 	cmd="$(echo "$1" | tr '-' '_')"
 	"cmd_${cmd}"