Remove unnecessary rank check in potrs call.
Remove unnecessary rank check in potrs call.

diz-vara/torch7,colesbury/torch7,adamlerer/torch7,colesbury/torch7,szagoruyko/torch7,adamlerer/torch7,diz-vara/torch7,Moodstocks/torch7,szagoruyko/torch7,Moodstocks/torch7