修复makefile的bug

kernel/driver/Makefile

@@ -0,0 +1,12 @@
+
+CFLAGS += -I .
+
+kernel_driver_subdirs:=video
+
+all: 
+	@list='$(kernel_driver_subdirs)'; for subdir in $$list; do \
+    		echo "make all in $$subdir";\
+    		cd $$subdir;\
+    		$(MAKE) all CFLAGS="$(CFLAGS)";\
+    		cd ..;\
+	done

kernel/driver/video/Makefile

@@ -0,0 +1,8 @@
+
+all: video.o
+
+CFLAGS += -I .
+
+
+video.o: video.c
+	gcc $(CFLAGS) -c video.c -o video.o

kernel/driver/video/video.c

@@ -0,0 +1,11 @@
+#include "video.h"
+
+/**
+ * @brief 初始化显示模块
+ * 
+ * @return int 
+ */
+int video_init()
+{
+
+}

kernel/driver/video/video.h

@@ -0,0 +1,8 @@
+#pragma once
+
+/**
+ * @brief 初始化显示模块
+ * 
+ * @return int 
+ */
+int video_init();