fix brown paperbag bug in inlined copy_..._iter()
"copied nothing" == "return 0", not "return full size". Fixes: aa28de27 "iov_iter/hardening: move object size checks to inlined part" Spotted-by: NArnd Bergmann <arnd@arndb.de> Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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