code review for 6832651 (a one line fix)

[mark powers]

Folks,

Could I get a code review for a one line fix?

6832651 panic in sha2_mac_verify_atomic()

The missing line is present in sha2_mac_atomic() but
not in sha2_mac_verify_atomic().

http://cr.opensolaris.org/~mcpowers/sha384/

Thanks.

Mark