db: fixup printing return info for difficult to split things
I'm not sure about that this is a complete fix.
When I wrote this I was expecting that we would always some states in
the ->possible list that weren't ->merged. The reason this happens is
because implied states are merged but we don't store the ->left and ->right
because only part of them are saved...
I'm not sure that smatch_implied.c is doing the right thing here. Perhaps
the right fix is changing that... Have to look into that.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>