tests/test_x86: prefix[] size is now 4, not 5
diff --git a/tests/test_x86.c b/tests/test_x86.c
index 82b1b77..e961474 100644
--- a/tests/test_x86.c
+++ b/tests/test_x86.c
@@ -42,7 +42,7 @@
 
 	x86 = &(ins->detail->x86);
 
-	print_string_hex("\tPrefix:", x86->prefix, 5);
+	print_string_hex("\tPrefix:", x86->prefix, 4);
 
 	if (x86->segment != X86_REG_INVALID)
 		printf("\tSegment override: %s\n", cs_reg_name(handle, x86->segment));