improve type safety, use ppc_reg instead of unsigned int
diff --git a/tests/test_ppc.c b/tests/test_ppc.c
index 8b41592..3572fda 100644
--- a/tests/test_ppc.c
+++ b/tests/test_ppc.c
@@ -83,7 +83,7 @@
 				break;
 			case PPC_OP_MEM:
 				printf("\t\toperands[%u].type: MEM\n", i);
-				if (op->mem.base != X86_REG_INVALID)
+				if (op->mem.base != PPC_REG_INVALID)
 					printf("\t\t\toperands[%u].mem.base: REG = %s\n",
 							i, cs_reg_name(handle, op->mem.base));
 				if (op->mem.disp != 0)