Two fixes in openMP variables
In file Modules/xc_gga_drivers.f90 the variable 'sgn' in routine 'gcxc' and the variable 'rnull' in routine 'gcx_spin' have been put into openMP private.
In file Modules/xc_gga_drivers.f90 the variable 'sgn' in routine 'gcxc' and the variable 'rnull' in routine 'gcx_spin' have been put into openMP private.