Don't return a hard coded errno in vfs_fat_access

Why should the return value of vfs_fat_access be hard coded as ENOENT?
This hides errors like FR_DISK_ERR of the lower layers.

components/fatfs/vfs/vfs_fat.c

@@ -865,7 +865,7 @@ static int vfs_fat_access(void* ctx, const char *path, int amode)
         // it exists then it is readable and executable
     } else {
         ret = -1;
-        errno = ENOENT;
+        errno = fresult_to_errno(res);
     }
 
     return ret;