vb2_plane 'mapped' signed bit field

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Hi Pawel,
  'sparse' spotted that vb2_plane's mapped field is a signed
bitfield:

include/media/videobuf2-core.h:78:41 1 bit signed int

struct vb2_plane {
       void                    *mem_priv;
       int                     mapped:1;
};

that probably should be an unsigned int (I can see code that assigns
1 to it that just won't fit).

(Introduced by e23ccc0ad9258634e6d52cedf473b35dc34416c7 , spotted in
2.6.39-rc1 )

Dave
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