crypto: talitos - Correct dst != src case handling

Seems that dst == src, but this fixes the logic in case it's not.

Signed-off-by: Lee Nipper <lee.nipper@freescale.com>
Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>