Validus, a Singapore-based lending platform for small and medium-sized enterprises, is acquiring CitiBusiness’ loan portfolio for an undisclosed amount to bolster its top-line revenue and customer base and expand its growing loan book.  Nikhilesh Goel, co-founder and CEO of Validus, told TechCrunch that Validus expects to create synergies with the loan portfolio of CitiBusiness, Citi…