x86: Eliminate various 'set but not used' warnings

Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
Cc: Joerg Roedel <joerg.roedel@amd.com> (supporter:AMD IOMMU (AMD-VI))
Cc: iommu@lists.linux-foundation.org (open list:AMD IOMMU (AMD-VI))
Link: http://lkml.kernel.org/r/1305918786-7239-3-git-send-email-padovan@profusion.mobi
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/arch/x86/kernel/test_nx.c b/arch/x86/kernel/test_nx.c
index 787a5e4..3f92ce0 100644
--- a/arch/x86/kernel/test_nx.c
+++ b/arch/x86/kernel/test_nx.c
@@ -161,7 +161,7 @@
 	}
 
 #endif
-	return 0;
+	return ret;
 }
 
 static void test_exit(void)