Fix help and error messages

install/cl-kernel

@@ -10,7 +10,7 @@ LONGOPTS="help,no-install,kerneldir:,kernel-config:,make-tarball:,kernel-name:,k
 
 print_help() {
 	cat <<'EOF'
-Usage: cl-kernel [options] [-c FILE|-o] [DESTINATION]
+Usage: cl-kernel [options] [-c FILE|-o] [destination]
 
 Make kernel.
 
@@ -283,7 +283,7 @@ mkdir -p ${DESTINATION}
 # tarball should be created in empty directory
 if [[ -n ${KERNEL_TARBALL} ]] && [[ $(ls $DESTINATION | wc -l ) -gt 2 ]];
 then
-	die "tarball should be created in empty directory"
+	die "tarball should be created in empty directory, need specify destination"
 fi
 BOOT_DIR=${DESTINATION%/}/boot