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tests/cc: Improve test 0152-cat.c

Returning different values in every case helps while debugging.

--- a/tests/cc/execute/0152-cat.c

+++ b/tests/cc/execute/0152-cat.c

@@ -3,12 +3,19 @@

 #define FOO foo

 #define BAR bar

+int foobar;

+

 int

 main(void)

 {

-	int foo, bar, foobar;

+	int foo = 1, bar = 0;

-	CAT(foo,bar) = foo + bar;

-	XCAT(FOO,BAR) = foo + bar;

+	CAT(foo,bar) += foo + bar;

+	if (foobar != 1)

+		return 1;

+	XCAT(FOO,BAR) += foo + bar;

+	if (foobar != 2)

+		return 2;

+

 	return 0;

 }