if_elseif error in some condition

```
local b,c,f

--error
if f(b)==3 then
    c = 4
elseif f(b)==4 then
    c = 5
else
    c = 6
end

--ok
if b==3 then
    c = 4
elseif b==4 then
    c = 5
else
    c = 6
end

--output
if f(b) == 3 then
  c = 4
else
  if f(b) == 4 then
    c = 5
  end
else
  c = 6
end

```

Original issue reported on code.google.com by `virusc...@gmail.com` on 7 Jul 2013 at 1:20
