crypto: talitos - avoid memleak in talitos_alg_alloc()

Cc: <stable@vger.kernel.org> # 3.2+
Fixes: 1d11911a ("crypto: talitos - fix warning: 'alg' may be used uninitialized in this function")
Signed-off-by: Horia Geanta <horia.geanta@freescale.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>