Fix to return negative error code -ENOMEM from the ioremap() error handling
case instead of 0, as done elsewhere in this function.

Fixes: 43986798 ("ipack: add error handling for ioremap_nocache")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Cc: stable <stable@vger.kernel.org>
Acked-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com>
Link: https://lore.kernel.org/r/20200507094237.13599-1-weiyongjun1@huawei.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>