Fixed BUG#9559: Functions: Numeric Operations using -ve value gives incorrect

results.
  Actually a problem when converting decimal to int for user variables.


mysql-test/r/sp.result:
  New test case for BUG#9559.
mysql-test/t/sp.test:
  New test case for BUG#9559.
sql/item_func.cc:
  Don't set the unsigned flag when converting decimal user var to int.

mysql-test/r/sp.result

@@ -3098,4 +3098,15 @@ call bug5963_2(1)|
 call bug5963_2(1)|
 drop procedure bug5963_2|
 drop table t3|
+drop function if exists bug9559|
+create function bug9559()
+returns int
+begin
+set @y = -6/2;
+return @y;
+end|
+select bug9559()|
+bug9559()
+-3
+drop function bug9559|
 drop table t1,t2;

mysql-test/t/sp.test

@@ -3801,6 +3801,25 @@ call bug5963_2(1)|
 drop procedure bug5963_2|
 drop table t3|
 
+#
+# BUG#9559: Functions: Numeric Operations using -ve value gives incorrect
+#           results.
+#
+--disable_warnings
+drop function if exists bug9559|
+--enable_warnings
+create function bug9559()
+  returns int
+begin
+  set @y = -6/2;
+  return @y;
+end|
+
+select bug9559()|
+
+drop function bug9559|
+
+
 #
 # BUG#NNNN: New bug synopsis
 #