make aio_read()/aio_write() return int

that ssize_t is a rudiment of earlier calling conventions; it's been
used only to pass 0 and -E... since last autumn.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2019-03-06 18:13:00 -05:00
commit 958c13ce14