[t:2355], fix max value of session variable

git-svn-id: file:///svn/mysql/tokudb-engine/tokudb-engine@17709 c7de825b-a66e-492c-adef-691d508d4ae1

storage/tokudb/hatoku_hton.cc

@@ -58,7 +58,7 @@ static MYSQL_THDVAR_ULONGLONG(write_lock_wait,
   NULL, 
   5000, // default
   0, // min?
-  1<<63, // max
+  ULONGLONG_MAX, // max
   1 // blocksize
   );