<fix>

修复报警信息，为以下修复点
1、修复空指针未判断
2、修复open后未及时close 导致内存泄露
3、修复strdup后未free
4、修复赋值后未使用等问题
5、修复编码中判断条件中无符号变量小于零的情况

Signed-off-by: xiacong <xiacong4@huawei.com>
Change-Id: I13d046141afeb8a116e6a04304a3793bf8e12bee
Signed-off-by: xiacong <xiacong4@huawei.com>

components/shell/src/cmds/vfs_shellcmd.c

@@ -544,11 +544,6 @@ STATIC INT32 OsShellCmdDoRmdir(const CHAR *pathname)
         }
         if (strcmp(dirent->d_name, "..") && strcmp(dirent->d_name, ".")) {
             size_t fullPathBufSize = strlen(pathname) + strlen(dirent->d_name) + SEPARATOR_EOF_LEN;
-            if (fullPathBufSize <= 0) {
-                PRINTK("buffer size is invalid!\n");
-                (VOID)closedir(d);
-                return -1;
-            }
             fullpath = (CHAR *)malloc(fullPathBufSize);
             if (fullpath == NULL) {
                 PRINTK("malloc failure!\n");