Fix to return a negative error code from the error handling
case instead of 0, as done elsewhere in this function.

Fixes: 7d9e6f5a ("usb: host: ohci-sm501: init genalloc for local memory")
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Link: https://lore.kernel.org/r/20200506135625.106910-1-weiyongjun1@huawei.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>