crypto: af_alg: Indent the loop in af_alg_sendmsg()

crypto: af_alg: Indent the loop in af_alg_sendmsg()

[ Upstream commit 73d7409cfdad7fd08a9203eb2912c1c77e527776 ]

Put the loop in af_alg_sendmsg() into an if-statement to indent it to make
the next patch easier to review as that will add another branch to handle
MSG_SPLICE_PAGES to the if-statement.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Herbert Xu <herbert@gondor.apana.org.au>
cc: "David S. Miller" <davem@davemloft.net>
cc: Eric Dumazet <edumazet@google.com>
cc: Jakub Kicinski <kuba@kernel.org>
cc: Paolo Abeni <pabeni@redhat.com>
cc: Jens Axboe <axboe@kernel.dk>
cc: Matthew Wilcox <willy@infradead.org>
cc: linux-crypto@vger.kernel.org
cc: netdev@vger.kernel.org
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Stable-dep-of: 9574b2330dbd ("crypto: af_alg - Set merge to zero early in af_alg_sendmsg")
Signed-off-by: Sasha Levin <sashal@kernel.org>