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Add an assertion that all colours are within range

Because I know I'm going to mess this up at some point.

--- a/midend.c

+++ b/midend.c

@@ -1348,6 +1348,9 @@

                 ret[i*3 + 1] = g / 255.0F;

                 ret[i*3 + 2] = b / 255.0F;

             }

+            assert(0.0F <= ret[i*3 + 0] && ret[i*3 + 0] <= 1.0F);

+            assert(0.0F <= ret[i*3 + 1] && ret[i*3 + 1] <= 1.0F);

+            assert(0.0F <= ret[i*3 + 2] && ret[i*3 + 2] <= 1.0F);

         }

     }