staging: erofs: removing an extra call to iloc() in fill_inode()

in fill_inode() we call iloc() twice.Avoiding the extra call by
storing the result.

Signed-off-by: Pratik Shinde <pratikshinde320@gmail.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Cc: Gao Xiang <gaoxiang25@huawei.com>
Link: https://lore.kernel.org/r/20190813203840.13782-1-pratikshinde320@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>