[fix][dfs] 修复elmfat挂载失败时的内存泄漏

Author: Unbear-Hz

components/dfs/dfs_v1/filesystems/elmfat/dfs_elm.c

@@ -156,7 +156,10 @@ int dfs_elm_mount(struct dfs_filesystem *fs, unsigned long rwflag, const void *d
         /* open the root directory to test whether the fatfs is valid */
         result = f_opendir(dir, drive);
         if (result != FR_OK)
+        {
+            rt_free(dir);
             goto __err;
+        }
 
         /* mount succeed! */
         fs->data = fat;

components/dfs/dfs_v2/filesystems/elmfat/dfs_elm.c

@@ -192,7 +192,10 @@ static int dfs_elm_mount(struct dfs_mnt *mnt, unsigned long rwflag, const void *
         /* open the root directory to test whether the fatfs is valid */
         result = f_opendir(dir, drive);
         if (result != FR_OK)
+        {
+            rt_free(dir);
             goto __err;
+        }
 
         /* mount succeed! */
         mnt->data = fat;