Fixed compile bug

[ghost]

kernel.cpp: In function ‘bool CheckProofOfStake(const CTransaction&, unsigned int, uint256&, uint256&)’: kernel.cpp:418:65: error: expected ‘;’ before ‘:’ token kernel.cpp:418:65: error: expected primary-expression before ‘:’ token kernel.cpp:418:65: error: expected ‘;’ before ‘:’ token kernel.cpp:425:180: error: expected ‘:’ before ‘;’ token kernel.cpp:425:180: error: expected primary-expression before ‘;’ token

[laudney]

Fixed in the original commit.