target/x86_64/Makefile: fix blocking typo

target/x86_64/Makefile

@@ -28,7 +28,7 @@ endif
 ifeq ($(ADK_TARGET_FS),initramfs)
 imageinstall: $(BIN_DIR)/$(INITRAMFS)
 	@cp $(KERNEL) $(BIN_DIR)/$(TARGET_KERNEL)
-	@echo 'The kernel file is: $(BIN_DIR)/${TARGET_KERNEL}
+	@echo 'The kernel file is: $(BIN_DIR)/${TARGET_KERNEL}'
 	@echo 'The initramfs image is: ${BIN_DIR}/${INITRAMFS}'
 ifeq ($(ADK_TARGET_SYSTEM_QEMU_X86_64),y)
 	@echo "Start qemu with following command line:"