Fix evaluation order in bbox deice

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Fix expression evaluation order in bbox device to avoid
access to uninitialized color and Purify warning.

Regression testing shows no differences.


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Index: gs/base/gdevbbox.c
===================================================================
--- gs/base/gdevbbox.c	(revision 9930)
+++ gs/base/gdevbbox.c	(working copy)
@@ -234,7 +234,7 @@
 }
 
 #define GX_DC_IS_TRANSPARENT(pdevc, bdev)\
-  (gx_dc_pure_color(pdevc) == (bdev)->transparent && gx_dc_is_pure(pdevc))
+  (gx_dc_is_pure(pdevc) && gx_dc_pure_color(pdevc) == (bdev)->transparent)
 
 static int
 bbox_close_device(gx_device * dev)

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