Re: Replace plain-memory ordered array by binary tree in ts_stat() function.

The patch mentioned in the subject leaves this compiler warning:

tsvector_op.c: In function ‘insertStatEntry’:
tsvector_op.c:815: warning: ‘res’ may be used uninitialized in this function

I took a quick look but it is not immediately obvious whether the 
compiler might actually have a point here.  Could you please fix this?