check return value of EC_POINT_mul

[Loganaden Velvindron]

Hi folks,

Check return value of EC_POINT_mul in VKO_compute_key.. Add an err
label when bailing out. A question remains however: shouldn't the



function itself (VKO_compute_key) have a way to check returned values
instead of returning 32.

Diff here:

http://elandsys.com/~logan/opensssl_483285.diff