Fix the initial colour for DeviceGray

We were accidentally setting the initial colour on a switch to the
Device Gray colour space to 1 instead of 0, which meant the initial
colour was white not black, as it should be.

Fixes several files:

Bug690921.pdf, Bug691602.pdf Bug691982.pdf, inherited_resources.pdf
fts_25_2525.pdf and fts_25_2527.pdf

1 files changed, 1 insertions, 1 deletions

diff --git a/pdf/pdf_colour.c b/pdf/pdf_colour.c
index 6c018458c..c36e150c8 100644
--- a/pdf/pdf_colour.c
+++ b/pdf/pdf_colour.c
@@ -2066,7 +2066,7 @@ static int pdfi_create_DeviceGray(pdf_context *ctx, gs_color_space **ppcs)
         }
         pdfi_set_colour_callback(*ppcs, ctx, pdfi_cspace_free_callback);
     } else {
-        code = pdfi_gs_setgray(ctx, 1);
+        code = pdfi_gs_setgray(ctx, 0);
     }
     return code;
 }