fuse_fill_write_pages(): don't bother with iov_iter_single_seg_count()

another rudiment of fault-in originally having been limited to the
first segment, same as in generic_perform_write() and friends.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2021-06-03 10:34:55 -04:00
commit 8959a23924