crypto: af_alg - Fix regression on empty requests

crypto: af_alg - Fix regression on empty requests

Some user-space programs rely on crypto requests that have no
control metadata.  This broke when a check was added to require
the presence of control metadata with the ctx->init flag.

This patch fixes the regression by setting ctx->init as long as
one sendmsg(2) has been made, with or without a control message.

Reported-by: Sachin Sant <[email protected]>
Reported-by: Naresh Kamboju <[email protected]>
Fixes: f3c802a1f300 ("crypto: algif_aead - Only wake up when...")
Signed-off-by: Herbert Xu <[email protected]>