Fix memory leak in Redcarpet::Render::Base
Fix memory leak in Redcarpet::Render::Base

rb_redcarpet_rbase_alloc used to allocate a rb_redcarpet_rndr instance
which was never freed.

This caused 312 leaked bytes (on a 64-bit machine) on every render call!

increments/greenmat,Hacker0x01/redcarpet,Hacker0x01/redcarpet,vmg/redcarpet,be9/redcarpet,be9/redcarpet,fukayatsu/redcarpet,Hacker0x01/redcarpet,fukayatsu/redcarpet,vmg/redcarpet,Hacker0x01/redcarpet,increments/greenmat,be9/redcarpet,kaneshin/redcarpet,fukayatsu/redcarpet,kaneshin/redcarpet,be9/redcarpet,vmg/redcarpet,fukayatsu/redcarpet,increments/greenmat,increments/greenmat,kaneshin/redcarpet,kaneshin/redcarpet,vmg/redcarpet