hwrng: core - Drop current rng in set_current_rng

Rather than having callers of set_current_rng call drop_current_rng,
we can do it directly in set_current_rng.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2014-12-23 16:40:21 +11:00
commit ff77c150f7