of: unittest: Fix of_count_phandle_with_args() expected value message

The expected result value for the call to of_count_phandle_with_args()
was updated from 7 to 8, but the accompanying error message was
forgotten.

Fixes: 4dde8356 ("of: Fix double free in of_parse_phandle_with_args_map")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20240111085025.2073894-1-geert+renesas@glider.beSigned-off-by: Rob Herring <robh@kernel.org>

drivers/of/unittest.c

@@ -574,7 +574,7 @@ static void __init of_unittest_parse_phandle_with_args_map(void)
 	}
 
 	rc = of_count_phandle_with_args(np, "phandle-list", "#phandle-cells");
-	unittest(rc == 8, "of_count_phandle_with_args() returned %i, expected 7\n", rc);
+	unittest(rc == 8, "of_count_phandle_with_args() returned %i, expected 8\n", rc);
 
 	for (i = 0; i < 9; i++) {
 		bool passed = true;