[poppler] Gfx::opSetFillRGBColor generates warnings

[Axel Strübing]

Dear popplers,

I lately noticed a lot of warnings
'Bad color space - expected name, array or dict'

These warnings are due to 
0 0 0 rg 
or similar (different numbers) in the content stream of a page. This command 
is valid pdf.

IMHO the cause is a typo in Gfx::opSetFillRGBColor where
------------
  if !obj.isNull()) {
    colorSpace = GfxColorSpace::parse(&obj, this);
  }
------------
should be  changed to 
------------
  if (!obj.isNull()) {
    colorSpace = GfxColorSpace::parse(&obj, this);
  }
------------

Despite this warning the further processing seems to be correct.

Please feel free to comment or correct me.

--
regards
Axel
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