FixedDegreeStringKernel: Kill pointless NULL assignment
FixedDegreeStringKernel: Kill pointless NULL assignment

A new value is assigned to sqrtdiag_lhs one line below.

besser82/shogun,karlnapf/shogun,geektoni/shogun,lambday/shogun,sorig/shogun,besser82/shogun,lambday/shogun,karlnapf/shogun,Saurabh7/shogun,Saurabh7/shogun,lambday/shogun,sorig/shogun,besser82/shogun,lisitsyn/shogun,shogun-toolbox/shogun,Saurabh7/shogun,lisitsyn/shogun,lambday/shogun,lisitsyn/shogun,lambday/shogun,shogun-toolbox/shogun,shogun-toolbox/shogun,karlnapf/shogun,Saurabh7/shogun,sorig/shogun,besser82/shogun,geektoni/shogun,Saurabh7/shogun,geektoni/shogun,shogun-toolbox/shogun,geektoni/shogun,lisitsyn/shogun,sorig/shogun,geektoni/shogun,besser82/shogun,geektoni/shogun,karlnapf/shogun,lisitsyn/shogun,shogun-toolbox/shogun,sorig/shogun,besser82/shogun,lambday/shogun,lisitsyn/shogun,karlnapf/shogun,sorig/shogun,karlnapf/shogun,Saurabh7/shogun,Saurabh7/shogun,Saurabh7/shogun,Saurabh7/shogun,shogun-toolbox/shogun