Coverity 1232, Potential out-of-bounds read.

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Fix a potential out-of-bounds read access in cvs and similar operators.
Regression testing shows no differences.




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Index: gs/psi/iutil.c
===================================================================
--- gs/psi/iutil.c	(revision 9301)
+++ gs/psi/iutil.c	(working copy)
@@ -477,7 +477,7 @@
 	    {
 		int rtype = r_btype(op);
 
-		if (rtype > countof(type_strings))
+		if (rtype >= countof(type_strings))
 		    return_error(e_rangecheck);
 		data = (const byte *)type_strings[rtype];
 		if (data == 0)



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